ACL Sinfonion
Polyphonic harmonic hub for musical modular synthesis
42 HP Eurorack module
The Sinfonion is a comprehensive harmonic CV processor combining three independent quantizer channels, a four-voice chord generator, an arpeggiator, and a chord progression sequencer in one Eurorack module. It is designed for polyphonic, harmonically coherent modular music, allowing all voices to share a common musical key and scale while each section plays different intervals, enabling jazz-inspired chord progressions, modal scales, and complex voicings to be sequenced and performed live.
Features
- Three independent quantizer channels (Channel 1, 2, 3) with selectable scale notes via musical interval buttons
- Four-voice chord generator with 98 possible voicings, spread control, and inversions
- Arpeggiator with 8 patterns (Up, Down, Up/Down, Down/Up, Baroque, Octaves, Brownian, Random), pitch, and range control
- Chord progression sequencer with 16 songs, 4 parts each, up to 32 steps per part (2048 total steps)
- 88 built-in base scales across multiple modes including Chords, Chords2, Slash chords, Major, Minor, Mel.Minor, Har.Minor, Har.Major, Db.H.Maj
- All five sections share the same musical key and scale simultaneously
- OLED display 128x64 pixels showing scale notes, chord structure, scale structure, or octave switches
- 8 highly accurate 16-bit DACs with output range -2V to +8V
- 16 highly accurate 16-bit ADCs covering -10.24V to +10.24V
- Input and Output routing matrices (4x4 input mixing matrix, 4-to-4 output switching matrix)
- Per-channel bypass modes: Normal Quantize, Soft Bypass (with transposition), True Bypass
- Per-channel octave switches (+/-3 octaves range, 7 positions)
Controls & Jacks (60)
- Arp 11th — Adjust chord voicing
- Ch 2 3rd — Start/stop sequencer playback
- Voicing Button 2 — Adjust chord voicing
- Ch 3 3rd — Increment step in sequence
- Step Decrement Button 2 — Decrement step in sequence
- Ch 3 EQ-Dist 2 — Cycle through sequencer modes
- Ch 2 Fill 5 — Select channel 1 for editing
- Ch 2 11th — Select chord type
- Arp 7th — Select step in sequence
- Octave Up Button 2 — Increment octave for channel 2
- Ch 2 Spread — Decrement octave for channel 2
- Octave Up Button 4 — Increment octave for channel 4
- Ch 3 Fill 2 — Decrement octave for channel 4
- Ch 2 13th — Select step in sequence
- CV 2 — CV input for master pitch modulation
- Chords 13th — Increment step in sequence
- Step Button Row 4 — Select step in sequence
- Chords INV — Select step in sequence
- Ch 3 11th — Select step in sequence
- Ch 3 EQ-Dist — Decrement step in sequence
- Ch 3 Fill 3 — Select chord type
- Ch 3 Root — Cycle through sequencer modes
- Arp Pattern
- ADD — Increment step in sequence
- Arp 3rd — Increment octave for channel 3
- BEATS +
- Ch 2 Fill 1 — Decrement octave for channel 1
- Ch 2 Root — Pitch control for channel 1
- Ch 2 7th
- Chords 3rd — Decrement octave for channel 3
- Ch 3 9th — Select channel 4 for editing
- Ch 3 13th — Select step in sequence
- Chords 7th
- MENU — Select channel 1 for editing
- Ch 1 A/B — Select step in sequence
- Ch 3 Fill 4
- Ch 2 Trig — Gate output for channel 3
- Chords 9th
- Ch 3 7th
- Ch 2 9th
- Arp Root — Pitch control for channel 1
- Chords 11th — Select step in sequence
- Ch 3 In — Reset input to restart sequences
- Chords Slew — Internal tempo control
- Octave Up Button 1 — Increment octave for channel 1
- Arp 5th
- Ch 2 In — Quantized pitch output
- Arp 13th
- Ch 1 7th
- Channel 2 Pitch CV Input — CV input for channel 2 pitch modulation
- Ch 3 5th — Select channel 3 for editing
- Chords 5th
- Ch 1 11th
- Arp 9th
- Root — Set the root note of the chord
- Ch 1 Fill — Adjust chord voicing
- Arp Begin — Adjust chord voicing
- Ch 1 13th
- Ch 1 In — CV input for channel 1 pitch modulation
- Ch 1 A/B — Pitch CV output for channel 4
How-To Guides
- Save Button Preset
- Load Button Preset
- Factory Reset
- Reset Menu Settings to Defaults
- Create a Jazz Chord Progression
- Modal Bass Line with Arpeggiator
- Evenly Distributed Random Melody
- Harmonic Complexity Builddown Effect
- Evolving Polyphonic Pad with Spread and Vibrato
- Two-Sinfonion Linked Performance
- CV-Sequenced Chord Voicing Melody
- Requantize and Transpose External Sequence
Explore the interactive Sinfonion panel on BleepDex — tap any control to learn what it does.
