Frap Tools Sapèl
Analog chaos generator with colored noise
18 HP Eurorack module
Sapèl is a comprehensive analog random voltage generator featuring four types of colored noise and dual independent random CV sections. Each section provides fluctuating random voltages, quantized outputs in semitones and octaves, and sample & hold circuits, all with probability distribution control for musical randomness.
Features
- Four colored noise outputs (blue, white, pink, red)
- Dual independent random CV sections
- Analog probability distribution control
- Quantized outputs in semitones (2^n) and octaves (n+1)
- Built-in clock generation with random clock outputs
- Manual sample & hold with gate modulation
- External clock input
- 100% analog random generation
Controls & Jacks (51)
- Yellow Probability — Sets probability distribution for random voltage magnitudes
- Yellow n+1 Stages — Sets n parameter (1-6) for n+1 quantized random voltages (2-7 octaves)
- Green Probability — Sets probability distribution for random voltage magnitudes
- Yellow Clock Rate — Controls internal clock frequency for yellow section
- Yellow Manual S&H — Manual sample and hold trigger button
- Green n+1 Stages — Sets n parameter (1-6) for n+1 quantized random voltages (2-7 octaves)
- Yellow Clock Output — Clock output for yellow section
- Yellow 2n Stages — Sets n parameter (1-6) for 2^n quantized random voltages (2-64 semitones)
- Green Manual S&H — Manual sample and hold trigger button
- Yellow 2n — Indicates yellow 2^n output voltage level
- Probability LED 4 — Probability distribution indicator
- Green Clock Rate — Controls internal clock frequency for green section
- Yellow 2n CV — CV modulation input for 2^n stages parameter
- Green 2n Stages — Sets n parameter (1-6) for 2^n quantized random voltages (2-64 semitones)
- Pink Noise Output — Pink noise output (-3dB/oct spectrum)
- Yellow Fluctuating Output — Smooth fluctuating random voltage output
- Yellow n+1 — Indicates yellow n+1 output voltage level
- Green Clock — Indicates green section clock pulses
- Yellow Clock — Indicates yellow section clock pulses
- Green Gate/CV Input — Gate input for manual S&H automation or CV for clock rate modulation
- Green 2n CV — CV modulation input for 2^n stages parameter
- Yellow Ext Clock — External clock input, replaces internal clock
- Green Clock Output — Clock output for green section
- Green 2n Output — 2^n quantized random voltage output (semitones)
- Green Mode — Mode switch for green section (more than / less than random clock behavior)
- Yellow Random Clock — Random clock output, behavior set by more/less mode
- Yellow n+1 Output — n+1 quantized random voltage output (octaves)
- Red Noise Output — Red/brown noise output (-6dB/oct spectrum)
- Green Random Clock LED — Indicates green random clock pulses
- Yellow Fluctuating Rate — Controls fluctuating random rate and global rate of change
- Blue Noise Output — Blue noise output (+3dB/oct spectrum)
- Yellow Gate/CV Input — Gate input for manual S&H automation or CV for clock rate modulation
- Green n+1 CV — CV modulation input for n+1 stages parameter
- Green Fluctuating Rate — Controls fluctuating random rate and global rate of change
- Green Ext Clock — External clock input, replaces internal clock
- Yellow n+1 CV — CV modulation input for n+1 stages parameter
- Yellow 2n Output — 2^n quantized random voltage output (semitones)
- Green n+1 — Indicates green n+1 output voltage level
- Green n+1 Output — n+1 quantized random voltage output (octaves)
- Green Random Clock — Random clock output, behavior set by more/less mode
- Green Fluctuating Output — Smooth fluctuating random voltage output
- Probability LED 3 — Probability distribution indicator
- Green S&H Output — Non-quantized sample and hold random voltage (0-7.5V)
- Probability LED 1 — Probability distribution indicator
- White Noise Output — White noise output (0dB/oct spectrum)
- Yellow Random Clock LED — Indicates yellow random clock pulses
- Yellow Mode — Mode switch for yellow section (more than / less than random clock behavior)
- Yellow S&H Output — Non-quantized sample and hold random voltage (0-7.5V)
- Probability LED 2 — Probability distribution indicator
- Green 2n — Indicates green 2^n output voltage level
- Probability LED 5 — Probability distribution indicator
How-To Guides
- Evolving Quantized Melody
- Synchronized Random Triggers
- Evolving Noise Landscape
- Weighted Random Bass Notes
- Stepped Random Modulation
- Chaotic Timing Control
- Hand-Triggered Random Events
- Dual Section Cross-Modulation
Explore the interactive Sapèl panel on BleepDex — tap any control to learn what it does.
