batumi

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.

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