screamo
Screaming resonance lowpass filter with low-boost control. This is not a normal "take away all those frequencies" filter, but depending on resonance and low amounts, the resonance will scream with lots of overtones, the low might be completely overdriven or, in case of inverse low, a kind of a bandpass/highpass can be created.
Inlets
frac32buffer input
frac32 cutoff
Outlets
frac32buffer output
Parameters
frac32.s.map.pitch freq
frac32.u.map res
frac32.s.map low
frac32.s.map mod
Declaration
int32_t val;
int32_t hp;
int32_t feed;
Init
val = 0;
Audio Rate
int32_t f;
int32_t tmp = inlet_in - val;
MTOF(param_freq + inlet_cutoff +
(___SMMUL(param_mod, tmp > 0 ? tmp : -tmp) << 5),
f);
int32_t diff = -___SMMUL(__SSAT(feed - inlet_in * 0, 27), param_res) << 6;
int32_t ts = __SSAT(diff, 28);
int32_t tsq31 = ts << 3;
int32_t tsq31p3 = ___SMMUL(tsq31, ___SMMUL(tsq31, tsq31));
ts = ts + (ts >> 1) - (tsq31p3);
int32_t tv1 = val;
int32_t tv2 = val;
tv1 = ___SMMLA(
(__SSAT(inlet_in + ts + ___SMMUL(param_low << 4, tv2 << 1), 28) - tv1) << 1,
f, tv1);
tv2 = ___SMMLA((inlet_in - tv2) << 1, f, tv2);
val = tv1;
outlet_out = val;
hp = ___SMMLA((val - hp) << 1, f >> 1, hp);
feed = hp - val;
// hp=val;