MIDI のnote番号と周波数[Hz]の対応表はググると色々出てくるのですが、表になっていてコピペできないものがほとんどだったので、コピペできるやつをおいておきますね。

uint16_t tones_i[128];
void createTones(){
  for(int i=0;i<128;++i){
    tones_i[i]=(uint16_t)(440.0*pow(2.0,(i-69)/12.0));
  }
}

const float tones[128]={
8.175798,
8.661958,
9.177023,
9.722718,
10.30086,
10.91338,
11.56233,
12.24986,
12.97827,
13.75,
14.56762,
15.43385,
16.3516,
17.32392,
18.35405,
19.44544,
20.60172,
21.82676,
23.12465,
24.49972,
25.95654,
27.5,
29.13523,
30.86771,
32.70319,
34.64783,
36.7081,
38.89087,
41.20344,
43.65353,
46.2493,
48.99942,
51.91309,
55,
58.27047,
61.73542,
65.40639,
69.29565,
73.4162,
77.78175,
82.40688,
87.30706,
92.4986,
97.99885,
103.8262,
110,
116.5409,
123.4708,
130.8128,
138.5913,
146.8324,
155.5635,
164.8138,
174.6141,
184.9972,
195.9977,
207.6523,
220,
233.0819,
246.9417,
261.6255,
277.1826,
293.6648,
311.127,
329.6276,
349.2282,
369.9944,
391.9954,
415.3047,
440,
466.1638,
493.8833,
523.2511,
554.3653,
587.3295,
622.254,
659.2551,
698.4565,
739.9888,
783.9908,
830.6094,
880,
932.3276,
987.7666,
1046.502,
1108.731,
1174.659,
1244.508,
1318.51,
1396.913,
1479.978,
1567.982,
1661.219,
1760,
1864.655,
1975.533,
2093.004,
2217.461,
2349.318,
2489.016,
2637.02,
2793.826,
2959.955,
3135.963,
3322.438,
3520,
3729.31,
3951.067,
4186.009,
4434.922,
4698.637,
4978.032,
5274.041,
5587.652,
5919.911,
6271.926,
6644.875,
7040,
7458.622,
7902.132,
8372.018,
8869.845,
9397.271,
9956.063,
10548.08,
11175.3,
11839.82,
12543.86
};