650円で作るArduino mozzi VCOモジュール-モジュラーシンセ自作
Arduino mozziライブラリを用いて、モジュラーシンセサイザー 2オシレータVCOモジュールを自作したので、その備忘録。
背景
コードの書けないシステムエンジニア脱却のために始めたプログラミングの18作品目。
本屋で「Arduinoではじめる手作り電子楽器」という本をみつけた。読んでみると、どうやらMozziというシンセサイザーに特化したライブラリがあるらしい。
Mozziライブラリには、ノコギリ波や三角波の様なプリミティブなオシレータの他にも、FMや、リバーブエフェクターにもなる様だ。しばらくはこのライブラリを使って、自作モジュールを作りたい。
制作物のスペック
ユーロラック規格 3U 6HPサイズ
電源：30mA ( at 5V ) / 29mA ( at12V )
5V単電源で動作可能。または12V単電源で動作可能。
出力波形：ノコギリ波、方形波、三角波、サイン波、ノイズ
2オシレータ
OSC1ツマミ：オシレータ1の周波数を変更
OSC2ツマミ：オシレータ2の周波数を変更
RATE IN：OSC1と2の音量割合を制御
V/oct（10bit , 5Vp-p)
トグルスイッチでオクターブを-1～+1切り替え。
製作費
総額650円
---------------------------------
Arduino nano 互換品200円
パネル 100円
オペアンプ 100円
etc
価格は平常時のもの。
2021年5月現在、世界的な半導体不足によりArduino nano互換品の値段が2倍に値上がりしている。STM32は、もはや入手すら難しい。
アメリカの寒波、台湾の水不足、コロナによる需要増加、日本の半導体工場の火災、ヨーロッパでのストライキ等、半導体産業の不幸が重なっている。
プログラミング
Mozziライブラリの使い方は、多くのwebページで紹介されているので、ここでは詳細を割愛。
ノウハウのみ記録する。
-V/oct
Arduino nanoは10bit ADCを搭載している。10bitという解像度は、ピッチを制御するには不足していると思い、対策を考えた。
まず、外付けの16bit ADCを検討したが、MozziとI2C通信の相性が悪く、あきらめた。
（探すとI2C通信が使える例もあるようだ。別の機会に挑戦したい。
"https://github.com/mgalardini/nuncha"）
次に、Mozziに搭載されているオーバーサンプリングを試した。サンプリング回数を増やすことで、10bitのADCを、疑似的に12bitにするというもの。
しかし、応答速度が大幅に遅れ、ポルタメントが掛かった感じになるため、採用は見送った。
次に、クオンタイズを検討した。最も簡単な方法ではあるが、ビブラートやドローンの様な使い方が出来なくなる。
スイッチでクオンタイズのON/OFFを切り替える事も検討したが、6HPというサイズの制限があるので見送り。
最後は結局、10bitで妥協した。というのも、10bitの解像度でも悪くないと思ったからだ。
5[V] / 2^10[bit] = 4.88 m[V/LSB]
1V / 12[Semitone = 1Oct] = 83.3m[V/Semitone]
つまり、ピッチのずれは最大でも
4.88m[V/LSB]÷83m[V/Semitone]=0.058[Semitone/LSB] = 6cent
6セントは、ギターチューニングならば十分許されるピッチのずれだ。
もちろん、部品のバラツキで2～3LSBのずれが発生する可能性もあるが、ホビーユースならば許容できる。
50万円するBuchlaも、MOOG 3Cも、ピッチのずれは大きい。モジュラーシンセはそういう楽器なのだ。と自分に言い聞かせた。
-RATE IN
OSC1とOSC2のゲインを制御するCV IN。
色んな割合を網羅するため、若干複雑なグラフになっている。
-CONTROL RATE
MozziはCONTROL RATEという演算周期を設定できる。
64Hzだと知覚できるレベルで遅い。
256Hzだと動作が不安定になる。
よって、中間の128Hzを採用した。
(2021.6.13追記)分圧を避けるためA7端子にある330kohm抵抗は、V/octと100ohmの間に設置したほうがよい。
ハードウェア
D9とD10のパッシブフィルタを工夫した。
推奨は1poleだが、3.9kohmと10nFのローパスフィルタを追加している。
可聴域まで削れてしまうが、PWMの嫌なノイズが大幅に低減される。
どうせモジュラーシンセに手を出すのは中年ばかりだ。高音なんて、聞こえなくていい。
V/octの入力回路も、オペアンプを使ってインピーダンスを分離するのが理想だが、あまり効果が無いと感じたので割愛している。
代わりに、プルダウン抵抗を330kohmと大きめに設定している。分圧による影響を小さくするためだ。
ソフトもハードも多く妥協したが、コストと工数のバランスを意識した設計のつもりだ。
宣伝：オープンソースプロジェクトの支援をお願いします
DIYモジュラーシンセのオープンソースプロジェクトを継続するために、patreonというサービスでパトロンを募集しています。
コーヒー一杯の支援をいただけると嬉しいです。
また、パトロン限定のコンテンツも配信しています。
ソースコード
粗末だが公開する。悪い点があれば教えてもらえると勉強になる。
Mozziライブラリのインストールは必須だ。
#include <MozziGuts.h>
#include <Oscil.h> // oscillator template
//#include <OverSample.h>
#include <tables/saw2048_int8.h> // saw table for oscillator
#include <tables/square_no_alias512_int8.h> // saw table for oscillator
#include <tables/triangle_hermes_2048_int8.h> // saw table for oscillator
#include <tables/sin2048_int8.h> // sine table for oscillator
#include <tables/whitenoise8192_int8.h> // noise table for oscillator
Oscil <SAW2048_NUM_CELLS, AUDIO_RATE> aSaw1(SAW2048_DATA);
Oscil <SAW2048_NUM_CELLS, AUDIO_RATE> aSaw2(SAW2048_DATA);
Oscil <SQUARE_NO_ALIAS512_NUM_CELLS, AUDIO_RATE> aSqu1(SQUARE_NO_ALIAS512_DATA);
Oscil <SQUARE_NO_ALIAS512_NUM_CELLS, AUDIO_RATE> aSqu2(SQUARE_NO_ALIAS512_DATA);
Oscil <TRIANGLE_HERMES_2048_NUM_CELLS, AUDIO_RATE> aTri1(TRIANGLE_HERMES_2048_DATA);
Oscil <TRIANGLE_HERMES_2048_NUM_CELLS, AUDIO_RATE> aTri2(TRIANGLE_HERMES_2048_DATA);
Oscil <SIN2048_NUM_CELLS, AUDIO_RATE> aSin1(SIN2048_DATA);
Oscil <SIN2048_NUM_CELLS, AUDIO_RATE> aSin2(SIN2048_DATA);
Oscil <WHITENOISE8192_NUM_CELLS, AUDIO_RATE> aNis1(WHITENOISE8192_DATA);
Oscil <WHITENOISE8192_NUM_CELLS, AUDIO_RATE> aNis2(WHITENOISE8192_DATA);
#define CONTROL_RATE 128 // Hz, powers of 2 are most reliable
int freq1 = 440;//base freq of OSC1
int freq2 = 220;//base freq of OSC2
int voct = 1000;//external V/OCT LSB
int freqv1 = 440;// freq1 apply voct
int freqv2 = 220;// freq2 apply voct
char octsw = 0;//1=-1oct,2=0oct,4=1oct
int wave_knob = 0;//AD wave knob
char wave = 0;//0_saw,1_squ,2_tri,3_sin,4_noise
byte gain = 127;
//const static float voctpow[4096] PROGMEM = {
// 0, 0.00122, 0.002441, 0.003662, 0.004882, 0.006103, 0.007324, 0.008544, 0.009765, 0.010986, 0.012207, 0.013427, 0.014648, 0.015869, 0.017089, 0.01831, 0.019531, 0.020751, 0.021972, 0.023193, 0.024414, 0.025634, 0.026855, 0.028076, 0.029296, 0.030517, 0.031738, 0.032958, 0.034179, 0.0354, 0.036621, 0.037841, 0.039062, 0.040283, 0.041503, 0.042724, 0.043945, 0.045166, 0.046386, 0.047607, 0.048828, 0.050048, 0.051269, 0.05249, 0.05371, 0.054931, 0.056152, 0.057373, 0.058593, 0.059814, 0.061035, 0.062255, 0.063476, 0.064697, 0.065917, 0.067138, 0.068359, 0.06958, 0.0708, 0.072021, 0.073242, 0.074462, 0.075683, 0.076904, 0.078125, 0.079345, 0.080566, 0.081787, 0.083007, 0.084228, 0.085449, 0.086669, 0.08789, 0.089111, 0.090332, 0.091552, 0.092773, 0.093994, 0.095214, 0.096435, 0.097656, 0.098876, 0.100097, 0.101318, 0.102539, 0.103759, 0.10498, 0.106201, 0.107421, 0.108642, 0.109863, 0.111083, 0.112304, 0.113525, 0.114746, 0.115966, 0.117187, 0.118408, 0.119628, 0.120849, 0.12207, 0.123291, 0.124511, 0.125732, 0.126953, 0.128173, 0.129394, 0.130615, 0.131835, 0.133056, 0.134277, 0.135498, 0.136718, 0.137939, 0.13916, 0.14038, 0.141601, 0.142822, 0.144042, 0.145263, 0.146484, 0.147705, 0.148925, 0.150146, 0.151367, 0.152587, 0.153808, 0.155029, 0.15625, 0.15747, 0.158691, 0.159912, 0.161132, 0.162353, 0.163574, 0.164794, 0.166015, 0.167236, 0.168457, 0.169677, 0.170898, 0.172119, 0.173339, 0.17456, 0.175781, 0.177001, 0.178222, 0.179443, 0.180664, 0.181884, 0.183105, 0.184326, 0.185546, 0.186767, 0.187988, 0.189208, 0.190429, 0.19165, 0.192871, 0.194091, 0.195312, 0.196533, 0.197753, 0.198974, 0.200195, 0.201416, 0.202636, 0.203857, 0.205078, 0.206298, 0.207519, 0.20874, 0.20996, 0.211181, 0.212402, 0.213623, 0.214843, 0.216064, 0.217285, 0.218505, 0.219726, 0.220947, 0.222167, 0.223388, 0.224609, 0.22583, 0.22705, 0.228271, 0.229492, 0.230712, 0.231933, 0.233154, 0.234375, 0.235595, 0.236816, 0.238037, 0.239257, 0.240478, 0.241699, 0.242919, 0.24414, 0.245361, 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0.369873, 0.371093, 0.372314, 0.373535, 0.374755, 0.375976, 0.377197, 0.378417, 0.379638, 0.380859, 0.38208, 0.3833, 0.384521, 0.385742, 0.386962, 0.388183, 0.389404, 0.390625, 0.391845, 0.393066, 0.394287, 0.395507, 0.396728, 0.397949, 0.399169, 0.40039, 0.401611, 0.402832, 0.404052, 0.405273, 0.406494, 0.407714, 0.408935, 0.410156, 0.411376, 0.412597, 0.413818, 0.415039, 0.416259, 0.41748, 0.418701, 0.419921, 0.421142, 0.422363, 0.423583, 0.424804, 0.426025, 0.427246, 0.428466, 0.429687, 0.430908, 0.432128, 0.433349, 0.43457, 0.435791, 0.437011, 0.438232, 0.439453, 0.440673, 0.441894, 0.443115, 0.444335, 0.445556, 0.446777, 0.447998, 0.449218, 0.450439, 0.45166, 0.45288, 0.454101, 0.455322, 0.456542, 0.457763, 0.458984, 0.460205, 0.461425, 0.462646, 0.463867, 0.465087, 0.466308, 0.467529, 0.46875, 0.46997, 0.471191, 0.472412, 0.473632, 0.474853, 0.476074, 0.477294, 0.478515, 0.479736, 0.480957, 0.482177, 0.483398, 0.484619, 0.485839, 0.48706, 0.488281, 0.489501, 0.490722, 0.491943, 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0.616455, 0.617675, 0.618896, 0.620117, 0.621337, 0.622558, 0.623779, 0.625, 0.62622, 0.627441, 0.628662, 0.629882, 0.631103, 0.632324, 0.633544, 0.634765, 0.635986, 0.637207, 0.638427, 0.639648, 0.640869, 0.642089, 0.64331, 0.644531, 0.645751, 0.646972, 0.648193, 0.649414, 0.650634, 0.651855, 0.653076, 0.654296, 0.655517, 0.656738, 0.657958, 0.659179, 0.6604, 0.661621, 0.662841, 0.664062, 0.665283, 0.666503, 0.667724, 0.668945, 0.670166, 0.671386, 0.672607, 0.673828, 0.675048, 0.676269, 0.67749, 0.67871, 0.679931, 0.681152, 0.682373, 0.683593, 0.684814, 0.686035, 0.687255, 0.688476, 0.689697, 0.690917, 0.692138, 0.693359, 0.69458, 0.6958, 0.697021, 0.698242, 0.699462, 0.700683, 0.701904, 0.703125, 0.704345, 0.705566, 0.706787, 0.708007, 0.709228, 0.710449, 0.711669, 0.71289, 0.714111, 0.715332, 0.716552, 0.717773, 0.718994, 0.720214, 0.721435, 0.722656, 0.723876, 0.725097, 0.726318, 0.727539, 0.728759, 0.72998, 0.731201, 0.732421, 0.733642, 0.734863, 0.736083, 0.737304, 0.738525, 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4.068603, 4.069824, 4.071044, 4.072265, 4.073486, 4.074707, 4.075927, 4.077148, 4.078369, 4.079589, 4.08081, 4.082031, 4.083251, 4.084472, 4.085693, 4.086914, 4.088134, 4.089355, 4.090576, 4.091796, 4.093017, 4.094238, 4.095458, 4.096679, 4.0979, 4.099121, 4.100341, 4.101562, 4.102783, 4.104003, 4.105224, 4.106445, 4.107666, 4.108886, 4.110107, 4.111328, 4.112548, 4.113769, 4.11499, 4.11621, 4.117431, 4.118652, 4.119873, 4.121093, 4.122314, 4.123535, 4.124755, 4.125976, 4.127197, 4.128417, 4.129638, 4.130859, 4.13208, 4.1333, 4.134521, 4.135742, 4.136962, 4.138183, 4.139404, 4.140625, 4.141845, 4.143066, 4.144287, 4.145507, 4.146728, 4.147949, 4.149169, 4.15039, 4.151611, 4.152832, 4.154052, 4.155273, 4.156494, 4.157714, 4.158935, 4.160156, 4.161376, 4.162597, 4.163818, 4.165039, 4.166259, 4.16748, 4.168701, 4.169921, 4.171142, 4.172363, 4.173583, 4.174804, 4.176025, 4.177246, 4.178466, 4.179687, 4.180908, 4.182128, 4.183349, 4.18457, 4.185791, 4.187011, 4.188232, 4.189453, 4.190673, 4.191894, 4.193115, 4.194335, 4.195556, 4.196777, 4.197998, 4.199218, 4.200439, 4.20166, 4.20288, 4.204101, 4.205322, 4.206542, 4.207763, 4.208984, 4.210205, 4.211425, 4.212646, 4.213867, 4.215087, 4.216308, 4.217529, 4.21875, 4.21997, 4.221191, 4.222412, 4.223632, 4.224853, 4.226074, 4.227294, 4.228515, 4.229736, 4.230957, 4.232177, 4.233398, 4.234619, 4.235839, 4.23706, 4.238281, 4.239501, 4.240722, 4.241943, 4.243164, 4.244384, 4.245605, 4.246826, 4.248046, 4.249267, 4.250488, 4.251708, 4.252929, 4.25415, 4.255371, 4.256591, 4.257812, 4.259033, 4.260253, 4.261474, 4.262695, 4.263916, 4.265136, 4.266357, 4.267578, 4.268798, 4.270019, 4.27124, 4.27246, 4.273681, 4.274902, 4.276123, 4.277343, 4.278564, 4.279785, 4.281005, 4.282226, 4.283447, 4.284667, 4.285888, 4.287109, 4.28833, 4.28955, 4.290771, 4.291992, 4.293212, 4.294433, 4.295654, 4.296875, 4.298095, 4.299316, 4.300537, 4.301757, 4.302978, 4.304199, 4.305419, 4.30664, 4.307861, 4.309082, 4.310302, 4.311523, 4.312744, 4.313964, 4.315185, 4.316406, 4.317626, 4.318847, 4.320068, 4.321289, 4.322509, 4.32373, 4.324951, 4.326171, 4.327392, 4.328613, 4.329833, 4.331054, 4.332275, 4.333496, 4.334716, 4.335937, 4.337158, 4.338378, 4.339599, 4.34082, 4.342041, 4.343261, 4.344482, 4.345703, 4.346923, 4.348144, 4.349365, 4.350585, 4.351806, 4.353027, 4.354248, 4.355468, 4.356689, 4.35791, 4.35913, 4.360351, 4.361572, 4.362792, 4.364013, 4.365234, 4.366455, 4.367675, 4.368896, 4.370117, 4.371337, 4.372558, 4.373779, 4.375, 4.37622, 4.377441, 4.378662, 4.379882, 4.381103, 4.382324, 4.383544, 4.384765, 4.385986, 4.387207, 4.388427, 4.389648, 4.390869, 4.392089, 4.39331, 4.394531, 4.395751, 4.396972, 4.398193, 4.399414, 4.400634, 4.401855, 4.403076, 4.404296, 4.405517, 4.406738, 4.407958, 4.409179, 4.4104, 4.411621, 4.412841, 4.414062, 4.415283, 4.416503, 4.417724, 4.418945, 4.420166, 4.421386, 4.422607, 4.423828, 4.425048, 4.426269, 4.42749, 4.42871, 4.429931, 4.431152, 4.432373, 4.433593, 4.434814, 4.436035, 4.437255, 4.438476, 4.439697, 4.440917, 4.442138, 4.443359, 4.44458, 4.4458, 4.447021, 4.448242, 4.449462, 4.450683, 4.451904, 4.453125, 4.454345, 4.455566, 4.456787, 4.458007, 4.459228, 4.460449, 4.461669, 4.46289, 4.464111, 4.465332, 4.466552, 4.467773, 4.468994, 4.470214, 4.471435, 4.472656, 4.473876, 4.475097, 4.476318, 4.477539, 4.478759, 4.47998, 4.481201, 4.482421, 4.483642, 4.484863, 4.486083, 4.487304, 4.488525, 4.489746, 4.490966, 4.492187, 4.493408, 4.494628, 4.495849, 4.49707, 4.498291, 4.499511, 4.500732, 4.501953, 4.503173, 4.504394, 4.505615, 4.506835, 4.508056, 4.509277, 4.510498, 4.511718, 4.512939, 4.51416, 4.51538, 4.516601, 4.517822, 4.519042, 4.520263, 4.521484, 4.522705, 4.523925, 4.525146, 4.526367, 4.527587, 4.528808, 4.530029, 4.53125, 4.53247, 4.533691, 4.534912, 4.536132, 4.537353, 4.538574, 4.539794, 4.541015, 4.542236, 4.543457, 4.544677, 4.545898, 4.547119, 4.548339, 4.54956, 4.550781, 4.552001, 4.553222, 4.554443, 4.555664, 4.556884, 4.558105, 4.559326, 4.560546, 4.561767, 4.562988, 4.564208, 4.565429, 4.56665, 4.567871, 4.569091, 4.570312, 4.571533, 4.572753, 4.573974, 4.575195, 4.576416, 4.577636, 4.578857, 4.580078, 4.581298, 4.582519, 4.58374, 4.58496, 4.586181, 4.587402, 4.588623, 4.589843, 4.591064, 4.592285, 4.593505, 4.594726, 4.595947, 4.597167, 4.598388, 4.599609, 4.60083, 4.60205, 4.603271, 4.604492, 4.605712, 4.606933, 4.608154, 4.609375, 4.610595, 4.611816, 4.613037, 4.614257, 4.615478, 4.616699, 4.617919, 4.61914, 4.620361, 4.621582, 4.622802, 4.624023, 4.625244, 4.626464, 4.627685, 4.628906, 4.630126, 4.631347, 4.632568, 4.633789, 4.635009, 4.63623, 4.637451, 4.638671, 4.639892, 4.641113, 4.642333, 4.643554, 4.644775, 4.645996, 4.647216, 4.648437, 4.649658, 4.650878, 4.652099, 4.65332, 4.654541, 4.655761, 4.656982, 4.658203, 4.659423, 4.660644, 4.661865, 4.663085, 4.664306, 4.665527, 4.666748, 4.667968, 4.669189, 4.67041, 4.67163, 4.672851, 4.674072, 4.675292, 4.676513, 4.677734, 4.678955, 4.680175, 4.681396, 4.682617, 4.683837, 4.685058, 4.686279, 4.6875, 4.68872, 4.689941, 4.691162, 4.692382, 4.693603, 4.694824, 4.696044, 4.697265, 4.698486, 4.699707, 4.700927, 4.702148, 4.703369, 4.704589, 4.70581, 4.707031, 4.708251, 4.709472, 4.710693, 4.711914, 4.713134, 4.714355, 4.715576, 4.716796, 4.718017, 4.719238, 4.720458, 4.721679, 4.7229, 4.724121, 4.725341, 4.726562, 4.727783, 4.729003, 4.730224, 4.731445, 4.732666, 4.733886, 4.735107, 4.736328, 4.737548, 4.738769, 4.73999, 4.74121, 4.742431, 4.743652, 4.744873, 4.746093, 4.747314, 4.748535, 4.749755, 4.750976, 4.752197, 4.753417, 4.754638, 4.755859, 4.75708, 4.7583, 4.759521, 4.760742, 4.761962, 4.763183, 4.764404, 4.765625, 4.766845, 4.768066, 4.769287, 4.770507, 4.771728, 4.772949, 4.774169, 4.77539, 4.776611, 4.777832, 4.779052, 4.780273, 4.781494, 4.782714, 4.783935, 4.785156, 4.786376, 4.787597, 4.788818, 4.790039, 4.791259, 4.79248, 4.793701, 4.794921, 4.796142, 4.797363, 4.798583, 4.799804, 4.801025, 4.802246, 4.803466, 4.804687, 4.805908, 4.807128, 4.808349, 4.80957, 4.810791, 4.812011, 4.813232, 4.814453, 4.815673, 4.816894, 4.818115, 4.819335, 4.820556, 4.821777, 4.822998, 4.824218, 4.825439, 4.82666, 4.82788, 4.829101, 4.830322, 4.831542, 4.832763, 4.833984, 4.835205, 4.836425, 4.837646, 4.838867, 4.840087, 4.841308, 4.842529, 4.84375, 4.84497, 4.846191, 4.847412, 4.848632, 4.849853, 4.851074, 4.852294, 4.853515, 4.854736, 4.855957, 4.857177, 4.858398, 4.859619, 4.860839, 4.86206, 4.863281, 4.864501, 4.865722, 4.866943, 4.868164, 4.869384, 4.870605, 4.871826, 4.873046, 4.874267, 4.875488, 4.876708, 4.877929, 4.87915, 4.880371, 4.881591, 4.882812, 4.884033, 4.885253, 4.886474, 4.887695, 4.888916, 4.890136, 4.891357, 4.892578, 4.893798, 4.895019, 4.89624, 4.89746, 4.898681, 4.899902, 4.901123, 4.902343, 4.903564, 4.904785, 4.906005, 4.907226, 4.908447, 4.909667, 4.910888, 4.912109, 4.91333, 4.91455, 4.915771, 4.916992, 4.918212, 4.919433, 4.920654, 4.921875, 4.923095, 4.924316, 4.925537, 4.926757, 4.927978, 4.929199, 4.930419, 4.93164, 4.932861, 4.934082, 4.935302, 4.936523, 4.937744, 4.938964, 4.940185, 4.941406, 4.942626, 4.943847, 4.945068, 4.946289, 4.947509, 4.94873, 4.949951, 4.951171, 4.952392, 4.953613, 4.954833, 4.956054, 4.957275, 4.958496, 4.959716, 4.960937, 4.962158, 4.963378, 4.964599, 4.96582, 4.967041, 4.968261, 4.969482, 4.970703, 4.971923, 4.973144, 4.974365, 4.975585, 4.976806, 4.978027, 4.979248, 4.980468, 4.981689, 4.98291, 4.98413, 4.985351, 4.986572, 4.987792, 4.989013, 4.990234, 4.991455, 4.992675, 4.993896, 4.995117, 4.996337, 4.997558, 4.998779
//};
const static float voctpow[1024] PROGMEM = {
0, 0.004882, 0.009765, 0.014648, 0.019531, 0.024414, 0.029296, 0.034179, 0.039062, 0.043945, 0.048828, 0.05371, 0.058593, 0.063476, 0.068359, 0.073242, 0.078125, 0.083007, 0.08789, 0.092773, 0.097656, 0.102539, 0.107421, 0.112304, 0.117187, 0.12207, 0.126953, 0.131835, 0.136718, 0.141601, 0.146484, 0.151367, 0.15625, 0.161132, 0.166015, 0.170898, 0.175781, 0.180664, 0.185546, 0.190429, 0.195312, 0.200195, 0.205078, 0.20996, 0.214843, 0.219726, 0.224609, 0.229492, 0.234375, 0.239257, 0.24414, 0.249023, 0.253906, 0.258789, 0.263671, 0.268554, 0.273437, 0.27832, 0.283203, 0.288085, 0.292968, 0.297851, 0.302734, 0.307617, 0.3125, 0.317382, 0.322265, 0.327148, 0.332031, 0.336914, 0.341796, 0.346679, 0.351562, 0.356445, 0.361328, 0.36621, 0.371093, 0.375976, 0.380859, 0.385742, 0.390625, 0.395507, 0.40039, 0.405273, 0.410156, 0.415039, 0.419921, 0.424804, 0.429687, 0.43457, 0.439453, 0.444335, 0.449218, 0.454101, 0.458984, 0.463867, 0.46875, 0.473632, 0.478515, 0.483398, 0.488281, 0.493164, 0.498046, 0.502929, 0.507812, 0.512695, 0.517578, 0.52246, 0.527343, 0.532226, 0.537109, 0.541992, 0.546875, 0.551757, 0.55664, 0.561523, 0.566406, 0.571289, 0.576171, 0.581054, 0.585937, 0.59082, 0.595703, 0.600585, 0.605468, 0.610351, 0.615234, 0.620117, 0.625, 0.629882, 0.634765, 0.639648, 0.644531, 0.649414, 0.654296, 0.659179, 0.664062, 0.668945, 0.673828, 0.67871, 0.683593, 0.688476, 0.693359, 0.698242, 0.703125, 0.708007, 0.71289, 0.717773, 0.722656, 0.727539, 0.732421, 0.737304, 0.742187, 0.74707, 0.751953, 0.756835, 0.761718, 0.766601, 0.771484, 0.776367, 0.78125, 0.786132, 0.791015, 0.795898, 0.800781, 0.805664, 0.810546, 0.815429, 0.820312, 0.825195, 0.830078, 0.83496, 0.839843, 0.844726, 0.849609, 0.854492, 0.859375, 0.864257, 0.86914, 0.874023, 0.878906, 0.883789, 0.888671, 0.893554, 0.898437, 0.90332, 0.908203, 0.913085, 0.917968, 0.922851, 0.927734, 0.932617, 0.9375, 0.942382, 0.947265, 0.952148, 0.957031, 0.961914, 0.966796, 0.971679, 0.976562, 0.981445, 0.986328, 0.99121, 0.996093, 1.000976, 1.005859, 1.010742, 1.015625, 1.020507, 1.02539, 1.030273, 1.035156, 1.040039, 1.044921, 1.049804, 1.054687, 1.05957, 1.064453, 1.069335, 1.074218, 1.079101, 1.083984, 1.088867, 1.09375, 1.098632, 1.103515, 1.108398, 1.113281, 1.118164, 1.123046, 1.127929, 1.132812, 1.137695, 1.142578, 1.14746, 1.152343, 1.157226, 1.162109, 1.166992, 1.171875, 1.176757, 1.18164, 1.186523, 1.191406, 1.196289, 1.201171, 1.206054, 1.210937, 1.21582, 1.220703, 1.225585, 1.230468, 1.235351, 1.240234, 1.245117, 1.25, 1.254882, 1.259765, 1.264648, 1.269531, 1.274414, 1.279296, 1.284179, 1.289062, 1.293945, 1.298828, 1.30371, 1.308593, 1.313476, 1.318359, 1.323242, 1.328125, 1.333007, 1.33789, 1.342773, 1.347656, 1.352539, 1.357421, 1.362304, 1.367187, 1.37207, 1.376953, 1.381835, 1.386718, 1.391601, 1.396484, 1.401367, 1.40625, 1.411132, 1.416015, 1.420898, 1.425781, 1.430664, 1.435546, 1.440429, 1.445312, 1.450195, 1.455078, 1.45996, 1.464843, 1.469726, 1.474609, 1.479492, 1.484375, 1.489257, 1.49414, 1.499023, 1.503906, 1.508789, 1.513671, 1.518554, 1.523437, 1.52832, 1.533203, 1.538085, 1.542968, 1.547851, 1.552734, 1.557617, 1.5625, 1.567382, 1.572265, 1.577148, 1.582031, 1.586914, 1.591796, 1.596679, 1.601562, 1.606445, 1.611328, 1.61621, 1.621093, 1.625976, 1.630859, 1.635742, 1.640625, 1.645507, 1.65039, 1.655273, 1.660156, 1.665039, 1.669921, 1.674804, 1.679687, 1.68457, 1.689453, 1.694335, 1.699218, 1.704101, 1.708984, 1.713867, 1.71875, 1.723632, 1.728515, 1.733398, 1.738281, 1.743164, 1.748046, 1.752929, 1.757812, 1.762695, 1.767578, 1.77246, 1.777343, 1.782226, 1.787109, 1.791992, 1.796875, 1.801757, 1.80664, 1.811523, 1.816406, 1.821289, 1.826171, 1.831054, 1.835937, 1.84082, 1.845703, 1.850585, 1.855468, 1.860351, 1.865234, 1.870117, 1.875, 1.879882, 1.884765, 1.889648, 1.894531, 1.899414, 1.904296, 1.909179, 1.914062, 1.918945, 1.923828, 1.92871, 1.933593, 1.938476, 1.943359, 1.948242, 1.953125, 1.958007, 1.96289, 1.967773, 1.972656, 1.977539, 1.982421, 1.987304, 1.992187, 1.99707, 2.001953, 2.006835, 2.011718, 2.016601, 2.021484, 2.026367, 2.03125, 2.036132, 2.041015, 2.045898, 2.050781, 2.055664, 2.060546, 2.065429, 2.070312, 2.075195, 2.080078, 2.08496, 2.089843, 2.094726, 2.099609, 2.104492, 2.109375, 2.114257, 2.11914, 2.124023, 2.128906, 2.133789, 2.138671, 2.143554, 2.148437, 2.15332, 2.158203, 2.163085, 2.167968, 2.172851, 2.177734, 2.182617, 2.1875, 2.192382, 2.197265, 2.202148, 2.207031, 2.211914, 2.216796, 2.221679, 2.226562, 2.231445, 2.236328, 2.24121, 2.246093, 2.250976, 2.255859, 2.260742, 2.265625, 2.270507, 2.27539, 2.280273, 2.285156, 2.290039, 2.294921, 2.299804, 2.304687, 2.30957, 2.314453, 2.319335, 2.324218, 2.329101, 2.333984, 2.338867, 2.34375, 2.348632, 2.353515, 2.358398, 2.363281, 2.368164, 2.373046, 2.377929, 2.382812, 2.387695, 2.392578, 2.39746, 2.402343, 2.407226, 2.412109, 2.416992, 2.421875, 2.426757, 2.43164, 2.436523, 2.441406, 2.446289, 2.451171, 2.456054, 2.460937, 2.46582, 2.470703, 2.475585, 2.480468, 2.485351, 2.490234, 2.495117, 2.5, 2.504882, 2.509765, 2.514648, 2.519531, 2.524414, 2.529296, 2.534179, 2.539062, 2.543945, 2.548828, 2.55371, 2.558593, 2.563476, 2.568359, 2.573242, 2.578125, 2.583007, 2.58789, 2.592773, 2.597656, 2.602539, 2.607421, 2.612304, 2.617187, 2.62207, 2.626953, 2.631835, 2.636718, 2.641601, 2.646484, 2.651367, 2.65625, 2.661132, 2.666015, 2.670898, 2.675781, 2.680664, 2.685546, 2.690429, 2.695312, 2.700195, 2.705078, 2.70996, 2.714843, 2.719726, 2.724609, 2.729492, 2.734375, 2.739257, 2.74414, 2.749023, 2.753906, 2.758789, 2.763671, 2.768554, 2.773437, 2.77832, 2.783203, 2.788085, 2.792968, 2.797851, 2.802734, 2.807617, 2.8125, 2.817382, 2.822265, 2.827148, 2.832031, 2.836914, 2.841796, 2.846679, 2.851562, 2.856445, 2.861328, 2.86621, 2.871093, 2.875976, 2.880859, 2.885742, 2.890625, 2.895507, 2.90039, 2.905273, 2.910156, 2.915039, 2.919921, 2.924804, 2.929687, 2.93457, 2.939453, 2.944335, 2.949218, 2.954101, 2.958984, 2.963867, 2.96875, 2.973632, 2.978515, 2.983398, 2.988281, 2.993164, 2.998046, 3.002929, 3.007812, 3.012695, 3.017578, 3.02246, 3.027343, 3.032226, 3.037109, 3.041992, 3.046875, 3.051757, 3.05664, 3.061523, 3.066406, 3.071289, 3.076171, 3.081054, 3.085937, 3.09082, 3.095703, 3.100585, 3.105468, 3.110351, 3.115234, 3.120117, 3.125, 3.129882, 3.134765, 3.139648, 3.144531, 3.149414, 3.154296, 3.159179, 3.164062, 3.168945, 3.173828, 3.17871, 3.183593, 3.188476, 3.193359, 3.198242, 3.203125, 3.208007, 3.21289, 3.217773, 3.222656, 3.227539, 3.232421, 3.237304, 3.242187, 3.24707, 3.251953, 3.256835, 3.261718, 3.266601, 3.271484, 3.276367, 3.28125, 3.286132, 3.291015, 3.295898, 3.300781, 3.305664, 3.310546, 3.315429, 3.320312, 3.325195, 3.330078, 3.33496, 3.339843, 3.344726, 3.349609, 3.354492, 3.359375, 3.364257, 3.36914, 3.374023, 3.378906, 3.383789, 3.388671, 3.393554, 3.398437, 3.40332, 3.408203, 3.413085, 3.417968, 3.422851, 3.427734, 3.432617, 3.4375, 3.442382, 3.447265, 3.452148, 3.457031, 3.461914, 3.466796, 3.471679, 3.476562, 3.481445, 3.486328, 3.49121, 3.496093, 3.500976, 3.505859, 3.510742, 3.515625, 3.520507, 3.52539, 3.530273, 3.535156, 3.540039, 3.544921, 3.549804, 3.554687, 3.55957, 3.564453, 3.569335, 3.574218, 3.579101, 3.583984, 3.588867, 3.59375, 3.598632, 3.603515, 3.608398, 3.613281, 3.618164, 3.623046, 3.627929, 3.632812, 3.637695, 3.642578, 3.64746, 3.652343, 3.657226, 3.662109, 3.666992, 3.671875, 3.676757, 3.68164, 3.686523, 3.691406, 3.696289, 3.701171, 3.706054, 3.710937, 3.71582, 3.720703, 3.725585, 3.730468, 3.735351, 3.740234, 3.745117, 3.75, 3.754882, 3.759765, 3.764648, 3.769531, 3.774414, 3.779296, 3.784179, 3.789062, 3.793945, 3.798828, 3.80371, 3.808593, 3.813476, 3.818359, 3.823242, 3.828125, 3.833007, 3.83789, 3.842773, 3.847656, 3.852539, 3.857421, 3.862304, 3.867187, 3.87207, 3.876953, 3.881835, 3.886718, 3.891601, 3.896484, 3.901367, 3.90625, 3.911132, 3.916015, 3.920898, 3.925781, 3.930664, 3.935546, 3.940429, 3.945312, 3.950195, 3.955078, 3.95996, 3.964843, 3.969726, 3.974609, 3.979492, 3.984375, 3.989257, 3.99414, 3.999023, 4.003906, 4.008789, 4.013671, 4.018554, 4.023437, 4.02832, 4.033203, 4.038085, 4.042968, 4.047851, 4.052734, 4.057617, 4.0625, 4.067382, 4.072265, 4.077148, 4.082031, 4.086914, 4.091796, 4.096679, 4.101562, 4.106445, 4.111328, 4.11621, 4.121093, 4.125976, 4.130859, 4.135742, 4.140625, 4.145507, 4.15039, 4.155273, 4.160156, 4.165039, 4.169921, 4.174804, 4.179687, 4.18457, 4.189453, 4.194335, 4.199218, 4.204101, 4.208984, 4.213867, 4.21875, 4.223632, 4.228515, 4.233398, 4.238281, 4.243164, 4.248046, 4.252929, 4.257812, 4.262695, 4.267578, 4.27246, 4.277343, 4.282226, 4.287109, 4.291992, 4.296875, 4.301757, 4.30664, 4.311523, 4.316406, 4.321289, 4.326171, 4.331054, 4.335937, 4.34082, 4.345703, 4.350585, 4.355468, 4.360351, 4.365234, 4.370117, 4.375, 4.379882, 4.384765, 4.389648, 4.394531, 4.399414, 4.404296, 4.409179, 4.414062, 4.418945, 4.423828, 4.42871, 4.433593, 4.438476, 4.443359, 4.448242, 4.453125, 4.458007, 4.46289, 4.467773, 4.472656, 4.477539, 4.482421, 4.487304, 4.492187, 4.49707, 4.501953, 4.506835, 4.511718, 4.516601, 4.521484, 4.526367, 4.53125, 4.536132, 4.541015, 4.545898, 4.550781, 4.555664, 4.560546, 4.565429, 4.570312, 4.575195, 4.580078, 4.58496, 4.589843, 4.594726, 4.599609, 4.604492, 4.609375, 4.614257, 4.61914, 4.624023, 4.628906, 4.633789, 4.638671, 4.643554, 4.648437, 4.65332, 4.658203, 4.663085, 4.667968, 4.672851, 4.677734, 4.682617, 4.6875, 4.692382, 4.697265, 4.702148, 4.707031, 4.711914, 4.716796, 4.721679, 4.726562, 4.731445, 4.736328, 4.74121, 4.746093, 4.750976, 4.755859, 4.760742, 4.765625, 4.770507, 4.77539, 4.780273, 4.785156, 4.790039, 4.794921, 4.799804, 4.804687, 4.80957, 4.814453, 4.819335, 4.824218, 4.829101, 4.833984, 4.838867, 4.84375, 4.848632, 4.853515, 4.858398, 4.863281, 4.868164, 4.873046, 4.877929, 4.882812, 4.887695, 4.892578, 4.89746, 4.902343, 4.907226, 4.912109, 4.916992, 4.921875, 4.926757, 4.93164, 4.936523, 4.941406, 4.946289, 4.951171, 4.956054, 4.960937, 4.96582, 4.970703, 4.975585, 4.980468, 4.985351, 4.990234, 4.995117
};
const static byte gain_table[2][128]PROGMEM = {
{127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 124, 121, 118, 115, 112, 109, 106, 103, 100, 97, 94, 91, 88, 85, 82, 79, 76, 73, 70, 67, 64, 62, 59, 56, 53, 50, 47, 44, 41, 38, 35, 32, 29, 26, 23, 20, 17, 14, 11, 8, 5, 2, 0, 2, 5, 8, 11, 14, 17, 20, 23, 26, 29, 32, 35, 38, 41, 44, 47, 50, 53, 56, 59, 62, 64, 67, 70, 73, 76, 79, 82, 85, 88, 91, 94, 97, 100, 103, 106, 109, 112, 115, 118, 127},
{127, 124, 121, 118, 115, 112, 109, 106, 103, 100, 97, 94, 91, 88, 85, 82, 79, 76, 73, 70, 67, 64, 62, 59, 56, 53, 50, 47, 44, 41, 38, 35, 32, 29, 26, 23, 20, 17, 14, 11, 8, 5, 2, 0, 2, 5, 8, 11, 14, 17, 20, 23, 26, 29, 32, 35, 38, 41, 44, 47, 50, 53, 56, 59, 62, 64, 67, 70, 73, 76, 79, 82, 85, 88, 91, 94, 97, 100, 103, 106, 109, 112, 115, 118, 121, 124, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127}
};
void setup()
{
// Serial.begin(9600);
pinMode(2, INPUT_PULLUP);
pinMode(3, INPUT_PULLUP);
startMozzi(CONTROL_RATE); // :)
}
void updateControl() {
//select waveform
wave_knob = mozziAnalogRead(3);
if (wave_knob <= 174) {
wave = 0;
}
else if (wave_knob > 174 && wave_knob <= 408) {
wave = 1;
}
else if (wave_knob > 408 && wave_knob <= 612) {
wave = 2;
}
else if (wave_knob > 612 && wave_knob <= 866) {
wave = 3;
}
else if (wave_knob > 866 ) {
wave = 4;
}
//output amp rate
gain = mozziAnalogRead(4) / 8;
//OCT toggle SW
if (digitalRead(3) == 1 && digitalRead(2) == 1) {
octsw = 2;
}
else if (digitalRead(3) == 0 && digitalRead(2) == 1) {
octsw = 4;
}
else {
octsw = 1;
}
//OSC frequency knob
freq1 = mozziAnalogRead(0) / 4 ;
freq2 = mozziAnalogRead(1) / 4 ;
if (abs(freq1 - freq2) <= 1 * octsw) {
freq2 = freq1;
}
else if (abs(freq1 * 2 - freq2) <= 1 * octsw) {
freq2 = freq1 * 2;
}
else if (abs(freq1 - freq2 * 2) <= 1 * octsw) {
freq2 = freq1 / 2;
}
//frequency setting
voct = mozziAnalogRead(7) ;
// voct = overSampler.next(voct)*2; //if need more resolution
freqv1 = freq1 * pow(2, (pgm_read_float(&(voctpow[voct])))) * octsw; // V/oct apply
freqv2 = freq2 * pow(2, (pgm_read_float(&(voctpow[voct])))) * octsw; // V/oct apply
switch (wave) {
case 0:
aSaw1.setFreq(freqv1); // set the frequency
aSaw2.setFreq(freqv2); // set the frequency
break;
case 1:
aSqu1.setFreq(freqv1); // set the frequency
aSqu2.setFreq(freqv2); // set the frequency
break;
case 2:
aTri1.setFreq(freqv1); // set the frequency
aTri2.setFreq(freqv2); // set the frequency
break;
case 3:
aSin1.setFreq(freqv1); // set the frequency
aSin2.setFreq(freqv2); // set the frequency
break;
case 4:
aNis1.setFreq(freqv1); // set the frequency
aNis2.setFreq(freqv2); // set the frequency
break;
}
//For development
// Serial.print(gain);
// Serial.print(",");
// Serial.print(mozziAnalogRead(4));
// Serial.println("");
}
int updateAudio() {
switch (wave) {
case 0:
return MonoOutput::from8Bit(aSaw1.next() * (pgm_read_byte(&(gain_table[0][gain]))) / 256 + aSaw2.next() * (pgm_read_byte(&(gain_table[1][gain]))) / 256);
break;
case 1:
return MonoOutput::from8Bit(aSqu1.next() * (pgm_read_byte(&(gain_table[0][gain]))) / 256 + aSqu2.next() * (pgm_read_byte(&(gain_table[1][gain]))) / 256);
break;
case 2:
return MonoOutput::from8Bit(aTri1.next() * (pgm_read_byte(&(gain_table[0][gain]))) / 256 + aTri2.next() * (pgm_read_byte(&(gain_table[1][gain]))) / 256);
break;
case 3:
return MonoOutput::from8Bit(aSin1.next() * (pgm_read_byte(&(gain_table[0][gain]))) / 256 + aSin2.next() * (pgm_read_byte(&(gain_table[1][gain]))) / 256);
break;
case 4:
return MonoOutput::from8Bit(aNis1.next() * (pgm_read_byte(&(gain_table[0][gain]))) / 256 + aNis2.next() * (pgm_read_byte(&(gain_table[1][gain]))) / 256);
break;
}
}
void loop() {
audioHook(); // required here
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