Schlappi Engineering 100 Grit
Dual resonant filter with distortion feedback and touch interaction
12 HP Eurorack module
The 100 Grit is a chaotic dual filter and distortion instrument from Schlappi Engineering. Built around two resonant filter cores with extensive cross-modulation and distortion feedback paths, it excels at generating everything from screaming leads to textured noise. The eight brass touch points connect directly to sensitive analog circuit nodes, letting you inject body capacitance into the signal path for unpredictable tonal shifts. The large central Frequency knob controls the primary filter pitch, while the x100 switch extends the range into audio-rate oscillation territory. Two separate audio inputs feed into independent distortion stages that can be cross-patched for complex feedback topologies.
Features
- Dual resonant filter with independent distortion stages
- Self-oscillation capable — works as a dual oscillator with x100 switch
- Eight brass touch points for hands-on circuit interaction
- Two FM inputs: one through distortion path, one clean
- Internal normalization creates default feedback distortion topology
- Three-position x100 switch with momentary spring position
- Separate DIST output for feedback patching or parallel processing
Controls & Jacks (20)
- Touch Points — Eight brass ball touch points connecting to sensitive analog circuit nodes for hands-on timbral manipulation
- LED Left — Blue LED indicator
- LED Right — Blue LED indicator
- IN 1 — Input 1 attenuator. Sub-label: Dist 2 — also routes to distortion circuit pole 2
- Frequency — Main frequency control for the filter/oscillator core
- x100 — Frequency multiplier toggle: ON (x100 always), OFF, (ON) momentary x100
- RES — Resonance control — sets filter resonance and self-oscillation point
- IN 2 — Input 2 attenuator. Sub-label: Dist FB — also routes to distortion feedback
- CV Dist 2 — CV attenuator for distortion circuit pole 2 frequency modulation
- CV Pole 2 — CV attenuator for filter pole 2 frequency modulation
- FM 1 — FM 1 attenuator. Sub-label: Dist FB — frequency modulation routed through distortion feedback
- RES CV — Resonance CV attenuator — controls depth of external resonance modulation
- OUT — Main audio output
- GAIN Input — Gain CV input for VCA control
- IN 1 Input — Audio input 1 — feeds filter and distortion circuit
- IN 2 Input — Audio input 2 — feeds filter, normalled to distortion output internally
- FM 1 Input — FM input 1 — frequency modulation through distortion feedback path
- FM 2 Input — FM input 2 — direct frequency modulation of filter
- DIST Output — Distortion circuit direct output
- GAIN Input — input cv
How-To Guides
- Self-Oscillating Drone
- Feedback Distortion
- Dual FM Chaos
- Touch-Controlled Filter
- Percussive Hits
Explore the interactive 100 Grit panel on BleepDex — tap any control to learn what it does.
