Warps: FM AND wavefolding?

chrisinfamie · June 26, 2019, 4:14pm

Bonjour, I have a question regarding Warps, to which I cannot seem to find a comprehensive answer online so far. If I use the internal OSC and run a modulating VCO into the T0-FM input, can I add wavefolding to the FM sound in crossfold mode? In my head, this should work, because the wavefolder receives the sum of input 1 and 2, correct? However, just wanted to ask you good folks over here to be sure ^^

pichenettes · June 26, 2019, 4:20pm

Yes it works.

chrisinfamie · June 26, 2019, 4:21pm

Merci!

RobertSyrett · August 29, 2019, 8:01pm

In the manual it says in addition to the sum of the two signals there is also “a tiny bit of cross-modulation product is added to spice things up.” I’m curious how this tiny bit was decided upon and what the expression for it might be.

pichenettes · August 30, 2019, 9:06am

How much?

github.com

pichenettes/eurorack/blob/master/warps/dsp/modulator.cc#L374


  return x_1 * fade_in + x_2 * fade_out;
}


/* static */
template<>
inline float Modulator::Xmod<ALGORITHM_FOLD>(
    float x_1, float x_2, float parameter) {
  float sum = 0.0f;
  sum += x_1;
  sum += x_2;
  sum += x_1 * x_2 * 0.25f;
  sum *= 0.02f + parameter;
  const float kScale = 2048.0f / ((1.0f + 1.0f + 0.25f) * 1.02f);
  return Interpolate(lut_bipolar_fold + 2048, sum, kScale);
}


/* static */
template<>
inline float Modulator::Xmod<ALGORITHM_ANALOG_RING_MODULATION>(
    float modulator, float carrier, float parameter) {
  carrier *= 2.0f;

The process?
Compile, listen, curate

RobertSyrett · August 30, 2019, 12:40pm

This makes perfect sense! I am appreciating all the little touches in Warps, way. Outside of complex oscillating, I have been enjoying the crossfader mixer and modulation mangler.

All hail the glowing knob!