ulu-electrico-bandersnatch

ULU ELECTRICO BANDERSNATCH

All-in-one TZFM oscillator meets analog wave shaper beast

16 HP Eurorack module

BANDERSNATCH is a 16HP Eurorack module combining a DSP-based Through-Zero FM oscillator (digital section) with a dual-channel analog wave shaper featuring drive and wavefolding. The digital section offers FM, PM, feedback, wavetable, bit-crushing, and LFO modes, while the analog section delivers everything from clean compression and overdrive to Serge/Buchla-style harmonic folding, all cascadable into a single semi-modular voice with one external sequencer.

Features

  • Through-Zero FM (TZFM) digital oscillator using DSP chip
  • FM, PM, and Feedback modulation with linear control analogous to Yamaha DX7
  • Feedback slider morphs from pure sine to near-sawtooth noise spectrum
  • Wavetable mode accepts audio input for vocoder/voice-changer-style formant processing
  • BIT CLUSH mode: bit-crushing applied only when PM CV crosses into negative voltage
  • LFO mode with ultra-slow speed capability (Sloth-style) controlled by FM knob
  • Hard SYNC in and out for oscillator synchronization
  • 1V/Oct input with calibration trimmer on rear panel
  • FM+PM OUT (main) and FM OUT (FM-only, for tuner or calibration use)
  • ANALOG DRIVE channel with switchable DIST and OD circuits and compression threshold
  • ANALOG FOLD channel with five-stage wavefolder inspired by Serge and Buchla designs
  • FOLD TYPE switch: asymmetric, symmetric, and NON (single fold + overdrive) modes

Controls & Jacks (34)

  • FM Out— FM oscillation output unaffected by phase modulation; suitable for tuner out or auto-tune functions
  • FM+PM Out— Main DIGITAL section output carrying oscillation affected by both FM and PM
  • 1V/Oct Input— 1V per octave pitch control input for melodic sequencing
  • PM CV Input— Phase modulation control voltage input; also bit-crusher input when BIT CLUSH enabled
  • DRIVE Out— Direct output from DRIVE channel; requires DRVch ON and DRIVE PHASE not centered
  • EXT In— External audio input to ANALOG section; auto-switches with DIP4 when no jack inserted
  • Blend Out— Crossfaded mix of DRIVE and FOLD channel outputs; controlled by Blend slider or expander
  • FM CV Input— Frequency modulation control voltage input
  • SYNC In— Hard sync input from master oscillator or external VCO
  • FB/WT Input— Feedback CV input when WAVETABLE off; audio signal input for wavetable/vocoder when WAVETABLE on
  • SYNC Out— Hard sync output for slaving external VCOs
  • SHAPE CV Input— Control-voltage or gate input for SHAPE gain.
  • SYMMETRY CV Input— Control-voltage input for the SYMMETRY slider.
  • FOLD Out— Direct output from FOLD channel
  • Fine— Precise fine-tuning of the FM operator oscillator pitch
  • SYMMETRY— Bipolar slider controlling waveform voltage offset and symmetry.
  • Coarse— Wide-range pitch adjustment for the FM operator oscillator
  • Feedback— Linear feedback control for FM operator oscillation, enabling harmonic complexity from pure sine waves to broad-band spectrum
  • BLEND Trimmer— Recessed trimmer controlling the DRIVE/FOLD crossfade when no expander is connected.
  • FM— Attenuator for FM CV input; applies frequency modulation to the oscillator. When LFO is on, controls modulation depth
  • PM— Attenuator for PM CV input; applies phase modulation to the operator. When BIT CLUSH is on, functions as bit crusher control
  • DRIVE PHASE— Three-position switch selecting in-phase, off, or inverted DRIVE-channel output.
  • SHAPE— Front-end gain slider for the analog section input.
  • SHAPE CV— Diagonal slider attenuating CV or gate applied to SHAPE.
  • FOLD TYPE— Three-position switch selecting asymmetric folding, symmetric folding, or NON center overdrive.
  • LFO— DIP switch enabling ultra-low-speed LFO mode with the FM knob controlling modulation depth.
  • BIT CLUSH— DIP switch enabling the manual-documented linear bit-clushing mode for the PM input.
  • WAVETABLE— DIP switch enabling wavetable mode for audio-rate input through FB/WT.
  • INTERNAL— DIP switch routing the DIGITAL section internally into the ANALOG section.
  • DIST— DIP switch enabling the DRIVE channel distortion circuit; combine with OD for alternate harmonic characters.
  • OD— DIP switch enabling the DRIVE channel overdrive circuit; combine with DIST for alternate harmonic characters.
  • DRV ch— DIP switch selecting the processed DRIVE-channel signal.
  • AUX IN— DIP switch selecting the dry or auxiliary input signal for the DRIVE channel.
  • Folding Compression Threshold— Three-position switch selecting pp compression, stronger ff compression, or center-off operation.

How-To Guides

  • Calibrate 1V/Oct Input
  • Pure Sine to Complex FM Sweep
  • Through-Zero FM with Bipolar LFO
  • Ultra-Slow Sloth LFO Drone
  • Rhythmic BIT CLUSH Degradation
  • Wavetable Voice Changer / Vocoder Effect
  • Digital Oscillator into Drive Distortion
  • Serge/Buchla-Style Wavefold Harmonics
  • SYMMETRY CV PWM-Style Modulation
  • DJ Crossfader Between Two Audio Sources (With Expander)
  • Metallic Hi-Hat and Drum Tones via High Feedback
  • CV-Controlled Drive to Fold Timbral Morph

Explore the interactive BANDERSNATCH panel on BleepDex — tap any control to learn what it does.

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