static const int blepvoices = 8;
int16_t *oscp[blepvoices];
uint32_t nextvoice;
int32_t i0;

int j;
for (j = 0; j < blepvoices; j++)
  oscp[j] = &blept[BLEPSIZE - 1];
nextvoice = 0;
i0 = 0;

int j;
int16_t *lastblep = &blept[BLEPSIZE - 1];
for (j = 0; j < BUFSIZE; j++) {
  int i;
  int i1 = inlet_in[j] >> 2;
  int32_t sum = 0;
  if ((i1 > 0) && !(i0 > 0)) { // dispatch
    nextvoice = (nextvoice + 1) & (blepvoices - 1);
    int32_t x = 64 - ((-i0 << 6) / (i1 - i0));
    oscp[nextvoice] = &blept[x];
  } else if ((i1 < 0) && !(i0 < 0)) { // dispatch
    nextvoice = (nextvoice + 1) & (blepvoices - 1);
    int32_t x = 64 - ((i0 << 6) / (i0 - i1));
    oscp[nextvoice] = &blept[x];
  }
  i0 = i1;
  for (i = 0; i < blepvoices; i++) { // sample
    int16_t *t = oscp[i];
    if (i & 1)
      sum += *t;
    else
      sum -= *t;
    t += 64;
    if (t >= lastblep)
      t = lastblep;
    oscp[i] = t;
  }
  sum -= ((((nextvoice + 1) & 1) << 1) - 1) << 13;
  outlet_out[j] = sum << 13;
}