int32_t lastTime;
int32_t step;
int32_t currentTime;
int32_t readPosition;

lastTime = 0;

int32_t time = ___SMMUL(inlet_time, inlet_mod) + inlet_time;

step = (time - lastTime) >> 4;
currentTime = lastTime;
lastTime = time;
readPosition = ((attr_delayname.writepos - BUFSIZE - 1) << 8);

currentTime += step;
uint32_t readp =
    readPosition - (currentTime >> (19 - attr_delayname.LENGTHPOW));

// no interpolation
#if attr_interpol == 0
outlet_out = attr_delayname.array[(readp >> 8) & attr_delayname.LENGTHMASK]
             << 14;
// linear (2pt) interpolation
#elif attr_interpol == 1
uint32_t rint = readp >> 8; // integral part of delay time
uint32_t rfrac =
    readp & 0x000000FF; // fractional part of delay time in Q8 notation
int32_t dout1 = attr_delayname.array[rint & attr_delayname.LENGTHMASK] << 13;
int32_t dout2 = attr_delayname.array[(rint + 1) & attr_delayname.LENGTHMASK]
                << 13;
outlet_out = ___SMMLA(rfrac << 23, (dout2 - dout1) << 1, dout1) << 1;
// qubic (3pt) interpolation
#elif attr_interpol == 2
uint32_t rint = readp >> 8; // integral part of delay time
uint32_t rfrac =
    readp & 0x000000FF; // fractional part of delay time in Q8 notation
// basic formula: y = ax^2 + bx + c
// a = 1/2*y3 - y2 + 1/2*y1
// b = -1/2*y3 + 2*y2 - 3/1*y1
// c = y1
// rearranged formula
// y = y1*c1 + y2*c2 + y3*c3
// c1 = 1 + 1/2*x^2 - 3/2*x
// c2 = -x^2 + 2x
// c3 = 1/2*x^2 - 1/2*x
int32_t x2 = (rfrac * rfrac); // x^2 in Q16 notation
int32_t x22 = x2 >> 1;        // x^2 / 2
int32_t x12 = rfrac << 7;     // 1/2 * x
// in Q16 notation
int32_t c1 = (1 << 16) + (x22)-x12 - (rfrac << 8);
int32_t c2 = -x2 + (rfrac << 9);
int32_t c3 = (x22)-x12;
int32_t dout1 = attr_delayname.array[rint & attr_delayname.LENGTHMASK] << 14;
int32_t dout2 = attr_delayname.array[(rint + 1) & attr_delayname.LENGTHMASK]
                << 14;
int32_t dout3 = attr_delayname.array[(rint + 2) & attr_delayname.LENGTHMASK]
                << 14;
int32_t douttmp1 = ___SMMUL(dout1, c1 << 14);
int32_t douttmp2 = ___SMMLA(dout2, c2 << 14, douttmp1);
outlet_out = ___SMMLA(dout3, c3 << 14, douttmp2) << 2;
#endif

readPosition += (1 << 8);