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Subtractor front

Subtractor front view

Reasons Subtractor is a polyphonic subtractive synthesizer similar to classic analog synthesizers. Its has two oscillators, which can produce basic waveforms such as square, sawtooth, triangle, and sine. Additional waveforms based on samples can also be generated.

FeaturesEdit

The Subtractor features a mono output, 2 oscillators, noise generator, ring modulator, 2 filters, 2 LFOs, amp envelope, filter envelope, modulation envelope, mod-wheel routing, velocity routing, master level, portamento, legato/retrigger options, polyphony control, external modulation routing, gate CV inputs, modulation CV outputs, modulation CV inputs and sequencer control CV inputs.

ModulesEdit

Subtractor OSC12

OscillatorsEdit

Oscillator 1 & 2 are the source for the waveform produced through the Subtractor.


Phase Offset ModulationEdit

Phase Offset Modulation creates a copy of the waveform being generated by the oscillator (with some phase difference), then either multiplies it or subtracts it from the original waveform.

Phase - Adjusts the phase angle of the copied waveform compared to the original.

Mode - Toggles the phase offset modulation mode through:

  • (x) - Produces a waveform by multiplying the original and the copied waveform.
  • (-) - Produces a waveform by subtracting the original and copied waveform.
  • (o) - The oscillator will only produce the original waveform.


Subtractor Oscillator2

OscillatorEdit

The oscillator is the source of the basic waveform.

OSC 2 - Enables the second oscillator. OSC 2 is enabled/disabled by left clicking on the OSC 2 indicator

Waveform - The waveform button toggles the waveform between:

  1. Sawtooth.
  2. Square.
  3. Triangle.
  4. Sine.
  5. Sawtooth minus some harmonics.
  6. High harmonic content waveform
  7. Electric piano type waveform.
  8. Harpsichord/clavinet waveform
  9. Electric bass type waveform
  10. Sub bass type waveform
  11. Voice type waveform.
  12. Metallic waveform
  13. Organ type waveform 1
  14. Organ type waveform 2
  15. String type waveform 1
  16. String type waveform 2
  17. String type waveform 3
  18. Steel string guitar type waveform
  19. Brass type waveform
  20. Muted brass type waveform
  21. Saxaphone type waveform
  22. Trumpet type waveform
  23. Marimba type waveform 1
  24. Marimba type waveform 2
  25. Guitar type waveform
  26. Harp type waveform
  27. Vibraphone type waveform 1
  28. Vibraphone type waveform 2
  29. Bell type waveform 1
  30. Bell type waveform 2
  31. Bell type waveform 3
  32. Bell type waveform 4

Note: All 'type' waveforms are building-blocks of the instrument mentioned, not waveforms of the actual intruments.

Octave - The octave up/down buttons select the octave of the waveform. Ranges from 0 - 9, with 4 being 1:1 to MIDI input (Middle C from MIDI will play Middle C).

Semi - The semitone up/down buttons adjust the frequency of the oscillator by a semitone. Ranges from 0 - 12.

Cent - The cent up/down buttons adjust the frequence of the oscillator by 1/100th of a semi-tone. Ranges from -50 - +50.

Kbd. Track - When the keyboard tracking indicator is off, all MIDI note values are ignored - only NoteOn and NoteOff messages are acknowledged. Keyboard tracking is enabled/disabled by left clicking on the indicator.


Subtractor noise

NoiseEdit

The noise generator adds noise of various colors to the oscillators.

Noise - Enables the noise generator. Noise is enabled/disabled by left clicking on the indicator.

Decay - The decay knob adjusts how long the noise will remain audible after the NoteOn message is received.

Color - The color knob adjusts the color of the noise generated. Low values produce pink noise, high values produce white noise.

Level - The level knob adjusts the volume of the noise.


Misc.Edit

FM - The FM knob adjusts frequency modulation, where OSC 1 is the carrier and OSC 2 is the modulator. 0 = disabled.

Mix - The mix knob adjusts the level of the two oscillators. Low values increase OSC 1 level and decrease OSC 2 level, high values increase OSC 2 level and decrease OSC 1 level.

Ring Mod - Enables ring modulation. OSC 1 is multiplied with OSC 2 to produce sum and difference frequencies. Ring modulation is enabled/disabled by right clicking on the indicator


Subtractor filter 1 & 2

FiltersEdit

Filter 1 is a multi-mode filter with resonance control, while filter 2 is a 12dB/Oct low pass filter. The two filter can be linked.

Filter 1Edit

Freq - The frequency slider adjusts the filter cutoff frequency

Res - The resonance slider adjusts the filter resonance

Type - The type button toggles the filter type between:

  • Notch - Notch (band-reject) filter
  • HP 12 - Highpass filter, 12dB/Oct
  • BP 12 - Bandpass filter, 12dB/Oct
  • LP 12 - Lowpass filter, 12dB/Oct
  • LP 24 - Lowpass filter, 24 dB/Oct

Kbd - Adjusts keyboard tracking. Higher values mean higher notes will have a lower cutoff frequency.

Link - Enables Filter 1 Freq to set a starting cutoff frequency for Filter 2 Freq


Filter 2Edit

Filter 2 - Enables Filter 2

Freq - Adjusts the filter cutoff frequency

Res - Adjusts the filter resonance


Subtractor amp2

Amp EnvelopeEdit

The amp envelope controls the overall level of the Subtractor over time.

A - The attack slider adjusts the attack time of the amp envelope

D - The decay slider adjusts the decay time of the amp envelope

S - The sustain slider adjusts the sustain level of the amp envelope

R - The resonance slider adjusts the release time of the amp envelope


Subtractor filter envelope

Filter EnvelopeEdit

The filter envelope controls the cutoff frequency of the Subtractor over time. The amount that the envelope affects the filter is adjustable.

A - The attack slider adjusts the attack time of the filter envelope

D - The decay slider adjusts the decay time of the filter envelope

S - The sustain slider adjusts the sustain level of the filter envelope

R - The release slider adjusts the release time of the filter envelope

Amt - The amount knob adjusts the amount (scale) of the envelope sent to the filter

Invert - The invert button inverts the filter envelope


Subtractor mod envelope

Mod EnvelopeEdit

The modulation envelope is an auxiliary envelope that may be routed to one of several destinations.

A - The attack slider adjusts the attack time of the modulation envelope

D - The decay slider adjusts the decay time of the modulation envelope

S - The sustain slider adjusts the sustain level of the modulation envelope

R - The release slider adjusts the release time of the modulation envelope

Amt - The amount knob adjusts the amount (scale) of the envelope sent to the destination

Invert - The invert button inverts the modulation envelope

Dest - The destination button toggles the destination through:

  • Osc 1 - The envelope will modulate the pitch of Osc 1
  • Osc 2 - The envelope will modulate the pitch of Osc 2
  • Mix - The envelope will modulate the Mix control of Oscillators module
  • FM - The envelope will modulate the FM control of the Oscillators module
  • Phase - The envelope will modulate the Phase control of both Osc 1 & Osc 2
  • Freq 2 - The envelope will modulate the cutoff frequency of Filter 2


Subtractor LFO 1

LFO 1Edit

LFO 1 adds low frequency oscillation to one of several destinations. LFO 1 runs constantly, and is not re-triggered by new notes.

Waveform - The waveform button toggles the LFO waveform through (from top to bottom):

  • Triangle
  • Sawtooth (inverted)
  • Sawtooth
  • Square
  • Random (instant transitions)
  • Random (smooth transitions)

Dest - The destination button toggles the LFO destination through:

  • Osc 1, 2 - The LFO will modulate OSC 1 & OSC 2 pitch
  • Osc 2 - The LFO will modulate OSC 2 pitch
  • F.Freq - The LFO will modulate Filter 1 cutoff frequency
  • FM - The LFO will modulate the FM control of the Oscillators module
  • Phase - The LFO will modulate the Phase control of both Osc 1 & Osc 2
  • Mix - The LFO will modulate the Mix control of Oscillators module

Sync - The synchronize button changes the behaviour of the rate knob. When selected, the rate knob will sweep through fractions of a bar, rather than milliseconds.

Rate - The rate knob adjusts the frequency (speed) of the LFO. It is affected by the sync button

Amount - The amount knob adjusts the scale (amount) of modulation sent by the LFO to the destination


Subtractor LFO2

LFO 2Edit

LFO 2 adds low frequency oscillation to one of several destinations, and is re-triggered by new notes.

Dest - The destination button toggles the LFO destination through:

  • Osc 1, 2 - The LFO will modulate OSC 1 & OSC 2 pitch
  • Phase - The LFO will modulate the Phase control of both Osc 1 & Osc 2
  • F.Freq - The LFO will modulate Filter 1 cutoff frequency
  • Amp - The LFO will modulate the overall volume of the Subtractor

Rate - The rate knob adjusts the frequency (speed) of the LFO

Kbd - The keyboard tracking knob adjusts the frequency (speed) of the LFO compared the the note played. Higher values mean higher notes generate a higher frequency.

Amount - The amount knob adjusts the scale (amount) of modulation sent by the LFO to the destination

Delay - The delay knob adjusts the time difference between a note being struck and the LFO being triggered. Higher values mean longer delays

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