arm_fir_instance_q31 f;
q31_t state[BUFSIZE + BUFSIZE - 1];
static const uint32_t LENGTHPOW = attr_size;
static const uint32_t LENGTH = 1 << attr_size;
static const uint32_t LENGTHMASK = (1 << attr_size) - 1;
int32_t Array[LENGTH * attr_presets];
int i;
int j;
int32_t buffer[BUFSIZE];
bool rnd;
int32_t phase;
int32_t sine;
bool snc;
int32_t SNC;

arm_fir_init_q31(&f, BUFSIZE, 0, &state[0], BUFSIZE);
for (i = 0; i < LENGTH * attr_presets; i++) {
  Array[i] = (int32_t)(GenerateRandomNumber()) >> 2;
}

if (param_preset >= attr_presets) {
  PExParameterChange(&parent->PExch[PARAM_INDEX_attr_legal_name_preset],
                     attr_presets - 1, 0xFFFD);
}

uint32_t soft;
MTOF(param_softsync, soft)
int32_t freq;
MTOFEXTENDED(param_rate, freq)
freq = freq >> 14;
int32_t preset = param_preset + inlet_preset;
preset = preset - preset / attr_presets * attr_presets;
preset += preset < 0 ? attr_presets : 0;
preset = preset << LENGTHPOW;
for (i = 0; i < BUFSIZE; i++) {
  SNC -= ___SMMUL(SNC, soft) >> 7;
  if ((inlet_sync > 0) && !snc) {
    snc = 1;
    SNC += phase;
    phase = 0;
  } else if (inlet_sync <= 0) {
    snc = 0;
  }
  phase += freq;
  int32_t sine;
  SINE2TINTERP(phase + SNC, sine)
  sine = ___SMMUL(sine >> 2, param_mod << 2);
  sine = ___SMMUL(param_size << 3, i << 25) + sine;
  // sine=__USAT(sine,27);
  sine = sine & ((1 << 27) - 1);
  uint32_t asat = sine;
  int index = asat >> (27 - LENGTHPOW);
  int32_t y1 = Array[index + preset];
  int32_t y2 = Array[((index + 1) & LENGTHMASK) + preset];
  int frac = (asat - (index << (27 - LENGTHPOW))) << (LENGTHPOW + 3);
  int32_t rr;
  rr = ___SMMUL(y1, (1 << 30) - frac);
  rr = ___SMMLA(y2, frac, rr);
  buffer[i] = rr << 2;
}

f.pCoeffs = (q31_t *)buffer;

arm_fir_fast_q31(&f, (q31_t *)inlet_in, outlet_out, BUFSIZE);

bool RND = (inlet_rnd + param_rnd) & 1;
if ((RND > 0) && !rnd) {
  rnd = 1;
  for (i = 0; i < (LENGTH * attr_presets); i++) {
    Array[i] = (int32_t)(GenerateRandomNumber()) >> 3;
  }
} else if (RND == 0) {
  rnd = 0;
}