XAOC Devices Batumi II

Name: Batumi II
Brand: XAOC Devices

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)

Slider A— Controls channel A frequency in all modes (0.01–100Hz, up to 5kHz with CV). V/oct tracking. Master tempo for phase/divide/mult modes.
Slider C— In free mode: channel C frequency. In phase mode: C phase offset (0–360°). In divide/mult modes: C ratio factor (1–32).
Slider D— In free mode: channel D frequency. In phase mode: D phase offset (0–360°). In divide/mult modes: D ratio factor (1–32).
Mode LED— Shows current mode: red=free, yellow=phase, blue=divide, turquoise=mult. Blinks at threshold crossings.
Sync LED— Shows sync method: unlit=reset, lit yellow=tap-tempo sync.
Wave LED— Shows asgn waveform: red=tri, yellow=down saw, orange=up saw, green=trapezoid, blue=step-random, turquoise=smooth random.
FRQ CV A— CV input for channel A frequency. V/oct tracking. -10V to +10V. Always frequency regardless of mode.
FRQ·PH·RTO CV B— CV input for channel B. Function depends on mode: frequency/phase/ratio. -10V to +10V.
FRQ·PH·RTO CV C— CV input for channel C. Function depends on mode: frequency/phase/ratio. -10V to +10V.
FRQ·PH·RTO CV D— CV input for channel D. Function depends on mode: frequency/phase/ratio. -10V to +10V.
Reset/Sync A— Reset or sync input for channel A. Rising-edge sensitive. In sync mode, sets master tempo for all channels.
Reset/Sync B— Reset or sync input for channel B. Rising-edge. Tap-tempo sync only in free mode.
Reset/Sync C— Reset or sync input for channel C. Rising-edge. Tap-tempo sync only in free mode.
Reset/Sync D— Reset or sync input for channel D. Rising-edge. Tap-tempo sync only in free mode.
Sine A— Bipolar sine wave output ±5V from channel A. Anti-aliased with adaptive analog filtering.
Sine B— Bipolar sine wave output ±5V from channel B.
Sine C— Bipolar sine wave output ±5V from channel C.
Sine D— Bipolar sine wave output ±5V from channel D.
ASGN A— Assignable waveform output ±5V from channel A. Waveform set by Wave button.
ASGN B— Assignable waveform output ±5V from channel B.
ASGN C— Assignable waveform output ±5V from channel C.
ASGN D— Assignable waveform output ±5V from channel D.
RECT A— Bipolar rectangular wave output ±5V from channel A. Cannot be attenuated.
RECT B— Bipolar rectangular wave output ±5V from channel B. Cannot be attenuated.
RECT C— Bipolar rectangular wave output ±5V from channel C. Cannot be attenuated.
RECT D— Bipolar rectangular wave output ±5V from channel D. Cannot be attenuated.
Slider B— In free mode: channel B frequency. In phase mode: B phase offset (0–360°). In divide/mult modes: B ratio factor (1–32).
Mode— Cycles through modes: free→phase→divide→mult. Hold + Wave toggles sync method.
Wave— Cycles asgn waveform: tri→down saw→up saw→trapezoid→step random→smooth random. Hold + Mode toggles sync method.

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 II panel on BleepDex — tap any control to learn what it does.