461       double synth_out;              /* [-1, 1] */  in flow()  local
492             synth_out = sin(2 * M_PI * phase);  in flow()
504             synth_out = -1 + 2 * (phase < chan->p1);  in flow()
516             synth_out = -1 + 2 * phase;  in flow()
530               synth_out = -1 + 2 * phase / chan->p1;          /* In rising part of period */  in flow()
532               synth_out = 1 - 2 * (phase - chan->p1) / (1 - chan->p1); /* In falling part */  in flow()
545               synth_out = -1 + 2 * phase / chan->p1;  in flow()
547               synth_out = 1;  in flow()
549               synth_out = 1 - 2 * (phase - chan->p2) / (chan->p3 - chan->p2);  in flow()
551               synth_out = -1;  in flow()
563             synth_out = dB_to_linear(chan->p2 * -200);  /* 0 ..  1 */  in flow()
565               synth_out = synth_out * exp(phase * log(1 / synth_out) / chan->p1);  in flow()
567               synth_out = synth_out * exp((1 - phase) * log(1 / synth_out) / (1 - chan->p1));  in flow()
568             synth_out = synth_out * 2 - 1;      /* map 0 .. 1 to -1 .. +1 */  in flow()
571           default: synth_out = 0;  in flow()
575           synth_out = DRANQD1;  in flow()
579           synth_out = .5 * (DRANQD1 + DRANQD1);  in flow()
591           synth_out = chan->c0 + chan->c1 + chan->c2 + chan->c3  in flow()
599           do synth_out = chan->lp_last_out + DRANQD1 * (1. / 16);  in flow()
600           while (fabs(synth_out) > 1);  in flow()
601           chan->lp_last_out = synth_out;  in flow()
611           synth_out = range_limit(chan->hp_last_out, -1, 1);  in flow()
623         default: synth_out = 0;  in flow()
627       synth_out = synth_out * (1 - fabs(chan->offset)) + chan->offset;  in flow()
630         case synth_create: synth_out *=  SOX_SAMPLE_MAX; break;  in flow()
631         case synth_mix   : synth_out = (synth_out * SOX_SAMPLE_MAX + synth_input) * .5; break;  in flow()
632         case synth_amod  : synth_out = (synth_out + 1) * synth_input * .5; break;  in flow()
633         case synth_fmod  : synth_out *=  synth_input; break;  in flow()
635       *obuf++ = synth_out < 0? synth_out * p->gain - .5 : synth_out * p->gain + .5;  in flow()