Frap Tools Brenso
Dual analog oscillator with entangled FM, waveshaping, and amplitude modulation
30 HP Eurorack module
BRENSO is Frap Tools' primary analog source of articulated waveforms. It features two triangle-core oscillators (green and yellow) with exponential and linear through-zero FM, a comprehensive timbre modulation section with triangle shaper, pulse shaper with PWM, a wavefolder with ping capability, and a final amplitude/ring modulation stage. The green oscillator's sine wave is semi-normalled throughout as a modulation source via the Modulation Bus, giving internal complexity without patching. All semi-normalizations can be broken for external sources.
Features
- Dual analog triangle-core oscillators with excellent tracking over 6+ octaves
- Independent exponential and linear through-zero FM per oscillator
- Cross-modulation: both oscillators can modulate each other simultaneously
- FM deviation control (Hz-based) for frequency-proportional modulation depth
- Lock Sync for subtle pitch correction and Flip Sync for creative timbre generation
- V/Oct Integrator routes yellow pitch CV to green with adjustable glide
- Triangle Shaper morphs between sine, triangle, and logarithmic waveforms
- PWM circuit with selectable source (triangle or shaped triangle)
- Pulse Shaper waveshaper with harmonic emphasis and phase inversion
- Source crossfader blends triangle and pulse paths before wavefolding
- Pingable wavefolder with adjustable decay for percussive timbral attacks
- Wavefolder symmetry control for asymmetric folding and different overtone configurations
Controls & Jacks (60)
- Green Sine Output
- Green Triangle Output
- Green Square Output
- Green Sawtooth Output
- Yellow Sine Output
- Yellow Triangle Output
- Yellow Shaped Pulse Output
- Yellow Final Output
- Yellow Exp FM Input
- Yellow Linear TZFM Input
- Yellow FM Deviation CV Input
- Yellow V/Oct Input
- Green Fine Frequency
- Yellow Fine Frequency
- Yellow Exp FM Attenuator
- Yellow Linear TZFM Attenuator
- Yellow FM Deviation Attenuverter
- Yellow V/Oct Integrator Level
- Green Coarse Frequency
- Green Freq Lock
- Green Freq Lock LED
- Yellow Coarse Frequency
- Phase Relationship LED
- Yellow Freq Lock
- Yellow FM Deviation
- Green Exp FM Attenuator
- Green FM Deviation
- Green Linear TZFM Attenuator
- Green FM Deviation Attenuverter
- Triangle Shaper
- Pulse Width
- Pulse Shaper
- PWM Source LED
- Wavefolder Source
- Wavefolder
- Green Frequency Scale
- Green Frequency Scale LED
- Sync Mode
- Sync LED
- Triangle Shaper CV Attenuator
- PWM CV Attenuverter
- PWM Source LED
- Pulse Shaper CV Attenuator
- Shaped Pulse LED
- Wavefolder Source Attenuator
- Wavefolder Attenuator
- Wavefolder Symmetry
- Wavefolder Ping Decay
- AM/RM CV Attenuverter
- Green Sync Input
- Green V/Oct Integrator CV Input
- Triangle Shaper CV Input
- PWM CV Input
- Pulse Shaper CV Input
- Wavefolder Source CV Input
- Wavefolder CV Input
- Wavefolder Symmetry CV Input
- Modulation Bus Level
- AM/RM
- Green V/Oct Input
How-To Guides
- FM Bass Tone
- Pingable Wavefolder Percussion
- Internal Timbre Modulation
- Flip Sync Screaming Lead
- Ring Modulation Metallic Tones
- Green LFO Self-Modulation Patch
Explore the interactive Brenso panel on BleepDex — tap any control to learn what it does.
