Xaoc Devices — Batumi

• Manual PDF

Xaoc Devices Batumi II & Poti II Manual (PDF)

Creative Modulation Techniques for Batumi II (+Poti II)

Aimed at distorted percussive sounds, basslines (d&b/dubstep), and atmospheric pads

Batumi II is one of the deepest Eurorack LFO/VCOs, and with the Poti II expander you get extensive hands-on and CV modulation options per channel. Here’s how you can squeeze some unique and extreme sounds from them, based on the manual:

1. Distorted Percussive Sounds

Extreme Phase Modulation (Pseudo-FM Synthesis)

• How: Set Batumi II to Phase Mode (yellow LED). Use one channel at audio rate (using slider + CV as VCO), then patch another channel's output into the first channel’s FRQ/PH/RTO CV input.
• Result: This creates brutal FM-style timbres, perfect for metallic/harsh percussive hits. Modulating phase rapidly can morph sine waves into sharp, distorted clangs. If you have a VCA, use it to rhythmically gate the output for further percussive effect.

Hard Reset Sync for Glitchy Hits

• How: Feed rhythmic triggers (from sequencer or burst generator) into Batumi’s RESET/SYNC inputs in Reset Mode (LED off).
• Result: This hard-resets the phase, chopping or stuttering the LFO/VCO—perfect for digitally-glitchy clicks, folds, or repeating percussive blips.

Wavefolding Percussion with Poti II

• How: On the Poti II, select “Sine Out” for the target channel. Feed audio-rate CV into the corresponding SHAPE input.
• Result: The sine wave will be wavefolded and amplified dynamically (with auto-amplitude compensation), generating harsh, clangorous, or almost metallic percussion like you might hear in more aggressive modular techno or glitch.

2. Dubstep/Drum & Bass Basses

Audio-rate LFO as VCO with V/Oct Tracking

• How: Use any channel in Free Mode as a VCO, patch sequenced CV (from keyboard/sequencer) into the channel’s CV input—Batumi tracks 1V/oct pretty well.
• Result: You get classic sub bass, but with available complex waves (triangle, trapezoid, etc.), and random/smooth random for more experimental tones.

Bass Wobble via Wave Morph + Phase Sync

• How: Assign “asgn” output (triangle, saw, random, etc.) per channel with Poti II. Modulate wave shape by sending LFO or envelope into its SHAPE input (switch set to “asgn”).
• Result: Morphing between waves can make LFOs that “wobble” the timbre of your bass, giving you those famous dubstep modulated basslines—especially when passed through a filter or distortion.

Suboscillator Trick: Divide Mode

• How: In Divide Mode (blue LED), b/c/d channels become divisions of channel a. Set a to audio rate, others to 1, 2, 4, etc.—run trigs into reset/sync for phase variations.
• Result: Create a stack of related suboscillators at subharmonic intervals, dialing in classic reese or layered d&b basses by mixing waves.

3. Haunting Pads & Atmospheric Sounds

Multi-channel Random LFOs for Modulation

• How: In Free Mode, set b/c/d channels to stepped or smooth random via wave select. Patch their outputs into filter cutoff, VCA CV, reverb, etc.
• Result: Non-repeating, uncorrelated modulation lets pads drift, swell, and evolve organically—especially when each channel modulates a different effect.

Synchronous Morphing Pads in Phase/Divide/Mult Mode

• How: In Phase/Divide/Mult modes, all channels sync to channel a; set the others' sliders for phase/frequency offsets. Set each asgn output to a different waveform (using Poti II).
• Result: Generate four perfectly interlocked LFOs or VCOs, with each morphing/wobbling its own parameter, for shimmering, spectral pad atmospheres.

Modulating Wave Shape for Subtle Complexity

• How: Use Poti II SHAPE input CVs to slowly morph sine to folded or asgn output’s shape; especially on random and trapezoid shapes.
• Result: Pads that "breathe" and shimmer as overtones and timbre shift smoothly.

Advanced Tips

• VCAs after Batumi II: Process its output with VCAs/envelopes for "pluck" or "hit" envelopes.
• Cascading Reset: Patch Batumi II’s outputs into its own or another channel’s reset input for recursive, chaotic modulation.
• Clock-following LFOs: Use sync mode to lock Batumi II to external clocks for tempo-synced modulations (great for rhythmic pads and syncopated bounces).

Patching Scenarios

• Percussion: Batumi Sine Out → Wavefolded by SHAPE input → VCA (triggered by sequencer) → Distortion/FX.
• Dubstep Bass: Batumi Channel a in audio rate, modulated by Batumi Channel b LFO in phase mode, with asgn set to triangle, routed through filter and distortion.
• Atmospheric Pad: Multiple Batumi channels in random mode, each modulating different effect/parameter (reverb wet, filter cutoff, VCA gain, delay time).

Explore self-patching and feedback using Batumi's outputs into each other's CV and reset inputs for unpredictable, living results!

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