Notes: Freaq FM 8-bit Digital FM Generative Synthesiser
2 independent FM voices each with user-controllable waveform, modulation envelope and LFO, integrated with a 16-step generative sequencer.
Voices
2 independent 8-bit FM voices
2-operator FM (for old-school Prince Of Persia vibes!)
Multi-mode FM ratios - quantised, free-multiple, independent
Multiple operator waveforms for carrier & modulator - Sine, Triangle, Overdriven triangle, Saw, Square, Noise, Off
Attack/Decay modulation envelope per voice
LFO per voice with multiple waveforms and configurable destination: modulation envelope (attack, decay or depth), FM ratio, note length
Sequencer
2/1.5 track polymetric sequencer with up to 16 steps per track (Both tracks use same note sequence but can have different step-counts for poly-metric rhythms)
Multiple generative algorithms - (semi)random notes, (semi)random runs, arpeggio, drone
Sequence mutates/evolves at user-defined rate & note-density
Selectable tonic, octave & scale - Ionian (Major), Minor (Dorian), Pentatonic, Phrygian (GOA!), Octaves, Fifths
Tap-tempo control
Sync input & output (Korg Volca compatible)
16-step parameter-lock recording of synth parameters (track 1 only)
Hardware
Mono audio output (16KHz 14-bit DAC)
Sync input / output (0-5V rising-edge)
Powered by an Arduino Nano V3
112mm (w) x 100mm (d) x 40mm (h)
7-12V DC or micro USB powered
Specifications and Architecture
Voice Architecture
Voice 1
Voice 2
Carrier - 8-bit digital oscillator
Octave 0-7
Waveform - Sine, Triangle, Overdriven Triangle, Saw, Square, Noise, Off
Carrier - 8-bit digital oscillator
Octave 0-7
Waveform - Sine, Triangle, Overdriven Triangle, Saw, Square, Noise, Off
Modulator
FM Ratio
FM Ratio Mode - quantised, high-multiple, low-multiple, fixed
Waveform - Sine, Triangle, Overdriven Triangle, Saw, Square, Noise, Off
Modulator
FM Ratio
FM Ratio Mode - quantised, high-multiple, low-multiple, fixed
Waveform - Sine, Triangle, Overdriven Triangle, Saw, Square, Noise, Off
Modulation Envelope
Depth
Attack time
Decay time
Modulation Envelope
Depth
Attack time
Decay time
LFO
Depth
Rate
Waveform - Sine, Triangle, Overdriven Triangle, Saw, Square, Noise, Off
LFO
Depth
Rate
Waveform - Sine, Triangle, Overdriven Triangle, Saw, Square, Noise, Off
Parameter Locks
Per-step parameter locks:
Note length
LFO depth
FM Ratio
Modulation envelope attack, decay & depth
Parameter locks apply to track 1, but are recorded into the track with the longest sequence length. For example, if Track 1 has 3 steps and track 2 has 16 steps, you will record a 16-step parameter-lock sequence which is applied to track 1
Sequencer Architecture
Track 1: Sequence Length, Current Step
Track 2: Sequence Length, Current Step
Shared: Sequence Notes, Sequence Mutation Rate, Sequence Note Density, Sync pulse clock division (1-4 steps per pulse)
Specifications
Synthesis:2-operator FM, 8-bit digital oscillators
Polyphony: 2 bi-timbral voices
Sequencer: 2/1.5 track 16 step polymetric sequencer
Modulation: Attack/decay envelope per channel, Multi-waveform LFO per channel, Parameter locking per step (voice 1 only)
I/O:
Mono audio out
Sync in / out
DC power 9-12v
Micro USB (power and firmware update)
Eurorack power (with modification)
External Sync Input:
3.5mm mono jack
0-5V rising edge sync pulse
1-4 steps per pulse (user configurable)
External Sync Output:
3.5mm mono jack
0-5V rising edge sync pulse (15ms)
1 pulse output per 1-4 steps (user configurable)
Signal Output: 3.5mm mono jack, Signal output 14-bit 16384Hz DAC
Microprocessor: Arduino Nano V3 (ATMEGA328P)
Power supply:
Micro USB
9-12VDC 2.1mm Positive tip
Can be adapted for +12V eurorack power
Display: 8 x 8 LED matrix
Power consumption: 300mA @ 12VDC
Dimensions: 111mm (w) (~22HP) x 100mm (d) x 40mm (h)
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