5 // these are imported from audio.c
6 extern uint16_t envelope_index;
7 extern float note_timbre;
8 extern float polyphony_rate;
11 voice_type voice = default_voice;
13 void set_voice(voice_type v) {
17 void voice_iterate() {
18 voice = (voice + 1) % number_of_voices;
21 void voice_deiterate() {
22 voice = (voice - 1 + number_of_voices) % number_of_voices;
25 float voice_envelope(float frequency) {
26 // envelope_index ranges from 0 to 0xFFFF, which is preserved at 880.0 Hz
27 uint16_t compensated_index = (uint16_t)((float)envelope_index * (880.0 / frequency));
32 note_timbre = TIMBRE_50;
41 switch (compensated_index) {
43 note_timbre = TIMBRE_12;
47 note_timbre = TIMBRE_25;
51 note_timbre = .125 + .125;
63 // switch (compensated_index) {
68 // note_timbre = 0.5 * (21 - compensated_index) / 10;
74 // frequency = (rand() % (int)(frequency * 1.2 - frequency)) + (frequency * 0.8);
76 if (frequency < 80.0) {
78 } else if (frequency < 160.0) {
80 // Bass drum: 60 - 100 Hz
81 frequency = (rand() % (int)(40)) + 60;
82 switch (envelope_index) {
87 note_timbre = 0.5 * (21 - envelope_index) / 10;
94 } else if (frequency < 320.0) {
97 // Snare drum: 1 - 2 KHz
98 frequency = (rand() % (int)(1000)) + 1000;
99 switch (envelope_index) {
104 note_timbre = 0.5 * (21 - envelope_index) / 15;
111 } else if (frequency < 640.0) {
113 // Closed Hi-hat: 3 - 5 KHz
114 frequency = (rand() % (int)(2000)) + 3000;
115 switch (envelope_index) {
120 note_timbre = 0.5 * (21 - envelope_index) / 5;
127 } else if (frequency < 1280.0) {
129 // Open Hi-hat: 3 - 5 KHz
130 frequency = (rand() % (int)(2000)) + 3000;
131 switch (envelope_index) {
136 note_timbre = 0.5 * (51 - envelope_index) / 15;
148 switch (compensated_index) {
150 frequency = frequency / 4;
151 note_timbre = TIMBRE_12;
155 frequency = frequency / 2;
156 note_timbre = TIMBRE_12;
160 note_timbre = .125 - pow(((float)compensated_index - 20) / (200 - 20), 2)*.125;
169 // case octave_crunch:
170 // polyphony_rate = 0;
171 // switch (compensated_index) {
175 // frequency = frequency / 2;
176 // note_timbre = TIMBRE_12;
182 // frequency = frequency * 2;
183 // note_timbre = TIMBRE_12;
187 // note_timbre = TIMBRE_12;
193 // This slows the loop down a substantial amount, so higher notes may freeze
196 switch (compensated_index) {
201 // note_timbre = (sin((float)compensated_index/10000*OCS_SPEED) * OCS_AMP / 2) + .5;
202 // triangle wave is a bit faster
203 note_timbre = (float)abs((compensated_index*OCS_SPEED % 3000) - 1500) * ( OCS_AMP / 1500 ) + (1 - OCS_AMP) / 2;
208 case duty_octave_down:
211 note_timbre = (envelope_index % 2) * .125 + .375 * 2;
212 if ((envelope_index % 4) == 0)
214 if ((envelope_index % 8) == 0)
217 case delayed_vibrato:
220 note_timbre = TIMBRE_50;
221 #define VOICE_VIBRATO_DELAY 150
222 #define VOICE_VIBRATO_SPEED 50
223 switch (compensated_index) {
224 case 0 ... VOICE_VIBRATO_DELAY:
227 frequency = frequency * vibrato_lut[(int)fmod((((float)compensated_index - (VOICE_VIBRATO_DELAY + 1))/1000*VOICE_VIBRATO_SPEED), VIBRATO_LUT_LENGTH)];
231 // case delayed_vibrato_octave:
232 // polyphony_rate = 0;
233 // if ((envelope_index % 2) == 1) {
234 // note_timbre = 0.55;
236 // note_timbre = 0.45;
238 // #define VOICE_VIBRATO_DELAY 150
239 // #define VOICE_VIBRATO_SPEED 50
240 // switch (compensated_index) {
241 // case 0 ... VOICE_VIBRATO_DELAY:
244 // frequency = frequency * VIBRATO_LUT[(int)fmod((((float)compensated_index - (VOICE_VIBRATO_DELAY + 1))/1000*VOICE_VIBRATO_SPEED), VIBRATO_LUT_LENGTH)];
248 // case duty_fifth_down:
249 // note_timbre = 0.5;
250 // if ((envelope_index % 3) == 0)
251 // note_timbre = 0.75;
253 // case duty_fourth_down:
254 // note_timbre = 0.0;
255 // if ((envelope_index % 12) == 0)
256 // note_timbre = 0.75;
257 // if (((envelope_index % 12) % 4) != 1)
258 // note_timbre = 0.75;
260 // case duty_third_down:
261 // note_timbre = 0.5;
262 // if ((envelope_index % 5) == 0)
263 // note_timbre = 0.75;
265 // case duty_fifth_third_down:
266 // note_timbre = 0.5;
267 // if ((envelope_index % 5) == 0)
268 // note_timbre = 0.75;
269 // if ((envelope_index % 3) == 0)
270 // note_timbre = 0.25;