RASPEL
Key Features
- Combines resonant filtering, drive, and a post-filter wavefolder in one creative effect
- Offers LP2, LP4, LP6, HP2, HP4, and BP4 modes for bass shaping, sweeps, cleanup, and band-pass effects
- Saturates the input of every filter stage while keeping filter feedback linear to retain resonant peaks under drive
- Uses automatic gain compensation so DRIVE can be judged by density and character rather than loudness alone
- Provides Modern and Vintage circuit behavior, with the latter introducing stepped cutoff movement for a coarser digital character
- Includes 1x to 8x oversampling, a time-aligned parallel MIX control, and a phase-compensated low-frequency mono maker
- Supplies 50 level-matched factory presets and 14 DAW-automatable parameters with adjustable smoothing
Description
RASPEL is a resonant filter and wavefolder from Kreuzberg Audio that combines six filter types with per-stage saturation, so basses, leads, drums, and loops can get more aggressive without losing the filter peak. Its DRIVE control adds up to 30 dB before each filter stage while automatic gain compensation helps separate tonal change from a simple volume jump.
LP2, LP4, LP6, HP2, HP4, and BP4 cover rounded chord filtering, steep bass cuts, build-up high-passes, and focused band-pass effects. A post-filter CHARACTER wavefolder adds extra harmonics, while Modern and stepped Vintage circuit modes offer a choice between smooth movement and deliberately coarser cutoff behavior.
The processing path supports 1x, 2x, 4x, and 8x oversampling, plus a time-aligned parallel mix and a phase-compensated mono maker for keeping low frequencies centered. Rather than supplying an internal LFO, RASPEL exposes 14 parameters to DAW automation and includes SMOOTH timing for shaping whether cutoff moves snap or glide.
Fifty level-matched factory presets span warm saturation, filter sweeps, and more destructive break processing. It is a focused creative effect for producers who want a single filter-and-drive tool for acid-style bass movement, dense lead tones, or animated drum-loop transitions.
Frequently Asked Questions
What kind of effect is RASPEL?
RASPEL is a creative filter effect that combines resonant filtering, saturation, and a post-filter wavefolder. It is designed for tone shaping and movement on sources such as basses, leads, drums, pads, and loops.
Which filter modes does RASPEL include?
The developer lists six modes: LP2, LP4, LP6, HP2, HP4, and BP4. They cover low-pass, high-pass, and band-pass tasks, with LP6 providing the steepest low-pass response.
Does RASPEL have its own LFO?
No. Kreuzberg Audio says RASPEL has no internal LFO; its 14 parameters are intended to be automated by the DAW. The SMOOTH control adjusts how quickly the filter follows that automation.
What does the CHARACTER control do?
CHARACTER is a wavefolder placed after the filter. At zero it is fully off, while higher settings add increasingly strong folded harmonics after the filtering and DRIVE stages.
