Play a melody by notes sent from a phone

1int note[110]; 
2int micpin = 11;  //speaker
3char BTData; //data   from my phone
4int oct = 1; //octave
5int race = 200;  //speed of playing
6
7void   setup() {
8    Serial.begin(9600);
9    pinMode(micpin, OUTPUT);
10    note['c']   = 247;    //ces = H
11    note['C'] = 262;    //C
12    note['d'] = 277;    //des   = cis
13    note['D'] = 294;    //D
14    note['e'] = 311;    //es = dis
15    note['E']   = 330;    //E
16    note['f'] = 330;    //fes = E
17    note['F'] = 349;    //F
18     note['g'] = 370;    //ges = fis
19    note['G'] = 392;    //G
20    note['a']   = 415;    //as = gis
21    note['A'] = 440;    //A
22    note['h'] = 466;    //b   = ais
23    note['H'] = 494;    //H
24}
25
26void loop() {
27  delay(5);
28   
29  if (Serial.available()){
30      BTDataCases();
31   }
32}
33
34void   BTDataCases() {
35      BTData = Serial.read();
36      Serial.println(BTData);
37
38       switch(BTData) {
39        case '2':
40          oct = 1;
41          break;
42         case '3':
43          oct = 2;
44          break;
45        case '4':
46           oct = 4;
47          break;
48        case '5':
49          oct = 8;
50           break;
51        case '9':
52          race += 20;
53          break;           
54        case '8':
55          race -= 20;
56          if (race <   20) race = 20;
57          break;
58        default:
59          tone(micpin,   note[BTData] * oct, race);
60          delay(race + 100);
61        }
62     }

1int note[110]; 
2int micpin = 11;  //speaker
3char BTData; //data  from my phone
4int oct = 1; //octave
5int race = 200;  //speed of playing
6
7void  setup() {
8    Serial.begin(9600);
9    pinMode(micpin, OUTPUT);
10    note['c']  = 247;    //ces = H
11    note['C'] = 262;    //C
12    note['d'] = 277;    //des  = cis
13    note['D'] = 294;    //D
14    note['e'] = 311;    //es = dis
15    note['E']  = 330;    //E
16    note['f'] = 330;    //fes = E
17    note['F'] = 349;    //F
18    note['g'] = 370;    //ges = fis
19    note['G'] = 392;    //G
20    note['a']  = 415;    //as = gis
21    note['A'] = 440;    //A
22    note['h'] = 466;    //b  = ais
23    note['H'] = 494;    //H
24}
25
26void loop() {
27  delay(5);
28  
29  if (Serial.available()){
30      BTDataCases();
31   }
32}
33
34void  BTDataCases() {
35      BTData = Serial.read();
36      Serial.println(BTData);
37
38      switch(BTData) {
39        case '2':
40          oct = 1;
41          break;
42        case '3':
43          oct = 2;
44          break;
45        case '4':
46          oct = 4;
47          break;
48        case '5':
49          oct = 8;
50          break;
51        case '9':
52          race += 20;
53          break;          
54        case '8':
55          race -= 20;
56          if (race <  20) race = 20;
57          break;
58        default:
59          tone(micpin,  note[BTData] * oct, race);
60          delay(race + 100);
61        }
62     }