Oscillatorro

Type: Module

Category: Oscillators

Updated: Apr 10, 2021

Manufacturer: nekomatic

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$24.00

Oscillatorro is an experimental noise making machine. It takes little grains of a live signal, messes with them a bit in the frequency domain with some help from a standard sawtooth wave to finally transform them into an oscillator.

With it's default settings the Oscillatorro sounds just like any sawtooth oscillator. This is the default shape which we will use as the base and add to it various flavors extracted from the input signal. In this state only the following knobs have any effect:

  • Octave - by default the oscillator assumes the 0V makes the oscillator spin at ~262Hz which is around the note C4 however lots of CV controlled gear will play C2 at 0V. Thats why the Octave selection knob goes a bit further down than up. You can select 5 octaves down or 3 octaves up.
  • Tune - this knob allows smooth pitch adjustments from -7 to +7 semitones.
  • Frequency Mod - controls the balance between Even and Odd harmonics of the oscillator wave.
  • Phase Mod - applies shift to the phase of either Even or Odd harmonics.
  • Wobble - adds a bit of instability to the oscillator itself
  • Update Rate - controls how often new shape of the oscillator is calculated - higher frequency will obviously increase the CPU load.

With an incoming signal attached (or something frozen available) there are more adjustments possible:

  • Frequency Blend - adjust the blend between the frequency spectrum of the incoming signal with the frequencies of the base sawtooth wave.
  • Freq Mult toggle - switches from the regular arithmetic mean mix to a geometric one which tends to hit the high frequencies harder and results in less buzz in the sound.
  • Phase Blend - blends between the phase of the incoming signal with the phase of the base Sawtooth wave.
  • Sample Size - adjusts the size of the grain which will be sent for the analysis at the Update Rate, it can be as short as 0.1 milliseconds and up to 50 milliseconds.
  • Sample Wrap - to make the sample grain less buzzy we may want to wrap it around a bit to make the loop a bit less buzzy.
  • Freeze toggle - freezes a snapshot of the last 10 seconds of the live signal and use it as the grains source. Frozen snapshot is remembered when a preset is saved.
  • Look Back - works for both live and frozen signal, with this we can select how far in the past (up to 10 sec) is the bit of the signal which we want to process.
  • Spread - introduces instability to the position of the sample grain selected for the processing. Makes not much difference in live signal but may introduce interesting movement when the signal is frozen.

Most knobs have a CV jack associated accepting range from 0V to 5V - you can find the right jack by following the line from each knob.

On the bottom, apart from the Input jack we can find the usual suspects:

  • Hard Sync - when a rising signal crossing 0V is detected then the oscillator phase is reset to 0.
  • V/Oct - used as the pitch CV source, by default it tries to produce C4 at 0V but this can be adjusted by the Octave and Tune knobs
  • Out - not sure if this one needs a description :)