XAOC Devices Batumi
Quad LFO powerhouse from micro-slow to audio rate
10 HP Eurorack module
Batumi II is a quad wide-range voltage and tempo-controlled LFO offering four channels of modulation from ultra-slow to audio rates with V/oct tracking. It generates 12 simultaneous waveforms across four channels and operates in free, phase, divide, or mult modes for independent or synchronous multi-voice modulation. Its anti-aliased digital core with adaptive analog output filters gives it a smooth, organic character suitable as a central modulation hub for any modular patch.
Features
- Four channels of wide-range LFO from 9.76 microHz to 5.0kHz
- V/oct tracking throughout entire frequency range enabling VCO use
- 12 simultaneously available bipolar output waveforms (sine, asgn, rect per channel)
- Assignable waveform per channel: triangle, downward saw, upward saw, trapezoid, step random, smooth random
- Four operation modes: free, phase, divide, mult
- Per-channel reset and sync inputs responding to rising edges
- Two synchronization methods: reset and tap-tempo sync
- Anti-aliased digital waveform generation with adaptive analog output filters
- Frequency division factors: 1, 2, 3, 4, 5, 8, 16, 32
- Frequency multiplication factors: 1, 2, 3, 4, 5, 8, 16, 32
- Maximum frequency automatically reduced to stay below 5kHz in mult mode
- Phase mode enables FM-like timbres at audio rates via continuous CV modulation
Controls & Jacks (29)
- Saw/Asgn 1 — Assignable waveform output for channel 1. ±5V. Waveform selected via Wave button: triangle, saw, ramp, stepped, S&H, or random.
- Sine 4 — Sine wave output for channel 4.
- Frequency 1 — Sets the frequency of LFO channel 1. In Free mode: independent rate. In Phase mode: master frequency for all channels. In Divide mode: maste
- Saw/Asgn 4 — Assignable waveform output for channel 4.
- Reset/Sync 4 — Reset or sync input for channel 4.
- Saw/Asgn 2 — Assignable waveform output for channel 2.
- Square 4 — Square wave output for channel 4.
- Square 3 — Square wave output for channel 3.
- Saw/Asgn 3 — Assignable waveform output for channel 3.
- Square 2 — Square wave output for channel 2.
- Reset/Sync 2 — Reset or sync input for channel 2. Same behavior as channel 1.
- Reset/Sync 1 — Reset or sync input for channel 1. In Reset mode: rising edge restarts waveform at zero. In Sync (tap-tempo) mode: sets frequency from incom
- Frq/Ph/Div 4 — CV input for channel 4.
- Sine 1 — Sine wave output for channel 1. Bipolar ±5V. Anti-aliased with adaptive analog filtering.
- Reset/Sync 3 — Reset or sync input for channel 3.
- Reset All — Global reset input. Resets all four channels simultaneously to phase zero on rising edge.
- Frq/Ph/Div 2 — CV input for channel 2. Mode-dependent: frequency, phase offset, or division ratio.
- Frequency 4 / Phase / Amp / Div — Channel 4 control. Same mode-dependent behavior as channel 2.
- Frq/Ph/Div 3 — CV input for channel 3.
- Sine 3 — Sine wave output for channel 3.
- Frq/Ph/Div 1 — CV input for channel 1. Adds to slider position. V/oct tracking in Free mode. Controls phase offset (Phase mode) or division (Divide mode).
- Sine 2 — Sine wave output for channel 2. ±5V bipolar.
- Frequency 2 / Phase / Amp / Div — Channel 2 control. In Free mode: frequency. In Phase mode: phase offset from channel 1. In Divide mode: clock division ratio. In Quad mode:
- Frequency 3 / Phase / Amp / Div — Channel 3 control. Same mode-dependent behavior as channel 2.
- LFO 3 — Indicates LFO 3 output.
- Square 1 — Square/pulse wave output for channel 1. Bipolar ±5V. Fixed 50% duty cycle.
- LFO 1 — Indicates LFO 1 output rate and phase by blinking. Brightness follows the sine waveform.
- LFO 2 — Indicates LFO 2 output.
- LFO 4 — Indicates LFO 4 output.
How-To Guides
- Four Independent LFOs from Scratch
- Quadrature LFO at 0-90-180-270 Degrees
- Clock-Synced Polyrhythmic LFOs
- FM Synthesis with Phase Mode at Audio Rate
- Four Uncorrelated Random CV Sequences
- Harmonic Series LFO Stack
- Phase-Reset Polyrhythmic Sequences
- Slow-to-Fast LFO Bass Modulation
- Temporal Fugue with Phase-Shifted Random Sequences
- Clock-Synced PWM with Rect Output
Explore the interactive Batumi panel on BleepDex — tap any control to learn what it does.
