frac32 gain input
frac32buffer audio input
frac32buffer output
frac32buffer o2
int32_t prev;
int32_t step;
step = (inlet_v - prev) >> 4;
int32_t i = prev;
prev = inlet_v;
outlet_o1 = inlet_a + (___SMMUL(-inlet_a, i) << 5);
outlet_o2 = (___SMMUL(inlet_a, i) << 5);
i += step;