Specifications
General
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• included power supply: 220-110VAC, 50-60Hz, +15VDC 2A
• power consumption: 15W
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400x222x52mm
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3,8kg
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hi-gloss transparent plexiglas + powder coated steel
Voices
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analog
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stereo paning per oscillator
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• monophonic with external keyboard
• 5 voices polyphony with ALT’s mechanical keys or sliders
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• 1 VCO with sine waveform
• 4 VCOs with saw or triangle waveforms
• 1 white noise generator
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each oscillator can be quantized individually to a predefined scale:
• chromatic
• major
• minor
• minor pentatonic
• bhairav (byzantine)
final version: + ethio-jazz scale + user custom scales
(the current version is a prototype; the final version is the one all buyers will receive)
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• OSC1 (sine): 8 Hz to 8372 Hz
• OSC2 (saw or tri): 8 Hz to 1046 Hz
• OSC3 (saw or tri): 16 Hz to 2093 Hz
• OSC4 (saw or tri): 32 Hz to 4186 Hz
• OSC5 (saw or tri): 65 Hz to 8372 Hz
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• OSC1 (sine): +/- 4 octaves with coarse, +/-1 octave with fine
• OSC2-OSC5 (saw or tri): +/- 1 octave
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amplitude trigger for each voice
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1 octave transpose slider that affects all 5 voices. Root note selector in quantized mode.
Alter
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stereo Sallen-Key type
smooth transition between low pass (2 poles) to high pass (1 pole)
self oscillating at maximum resonance
final version:
2 stereo Sallen-Key in series
band pass / notch pass / low pass (4 poles) / high pass (2 poles) depending on filter 1 and filter 2 configuration
(the current version is a prototype; the final version is the one all buyers will receive)
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BBD based emulation, analog core with digital repeats 30ms to 1.5s
Movement
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2mm 4x17 matrix
connections made with provided 2mm banana pin
final version: 4x20 (TBC)
(the current version is a prototype; the final version is the one all buyers will receive)
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4 sources:
• 2 LFOs with square to triangle waveforms
• 1 random step generator (sample and hold) with +/-2V offset
• 1 envelope follower (Outline) with release control and built in electret microphone as default source or 3.5mm jack external source (audio or CV +/-5V)
final version: + osc sine (TBC)
(the current version is a prototype; the final version is the one all buyers will receive)
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17 destinations:
• VCA master (pre-delay)
• master pitch
• filter cut off
• delay speed
• VCO frequency (1-5)
• noise volume
• VCA (1-5)
• LFO1 frequency
• LFO2 frequency
final version (TBC):
+ filter2 cut off + random offset + random frequency
(the current version is a prototype; the final version is the one all buyers will receive)
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• LFOs: +/-5V, 0.1Hz–56Hz
• Random: +/-5V , 0.1Hz – 17Hz
• Outline: -5V/0V (negative only)
final version:
• LFOs: +/-5V, frequency range to be determined
• Random: +/-5V , 0.1Hz – 17Hz, MIDI clock (1/8, 3/4, 1/4 , 1/2, 1, 2, 3/2, 4, 8)
• Outline: -10V/0V or 0V/+10V switchable
(the current version is a prototype; the final version is the one all buyers will receive)
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2 light sensors modulating pitch and volume
(theremin-like gestures)
Inputs & Outputs
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• 3.5mm TS - Outline in - cv or audio - (assignable to the pin matrix as a modulation source)
• 3.5mm TS - CV master pitch
• 3.5mm TS - CV gate VCA master
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• 3.5mm TRS
features: master pitch, pitch bend, velocity, clock
Note that when played with an external MIDI controller, ALT is monophonic, meaning all 5 oscillators will be transposed according to the note played on the MIDI device. C4 being the reference with no transposition (but not necessarily a C).
You can use MIDI clock message to sync the Random frequency feature to *8, *4, *3, *2, 1, 1/2, 1/4, 1/8, 1/16 of the MIDI master clock.
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• 3.5mm TRS – headphones
• 6.35mm TS – left/mono
• 6.35mm TS - right
