Batumi

Xaoc Devices 10HP
fw 1974/5.3
LFO CLOCK UTILITY

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Quadruple digital LFO with four sync modes: free, quadrature, variable phase, and division. Per-channel sine, saw/assignable, square outputs. V/oct-capable frequency CV extends range to 28 hours.

Patch Ideas · 8

★ Quadrature stereo modulation
QUAD mode · SINE 1 and SINE 3 (180° apart) sweep stereo filter cutoffs; SINE 2 and SINE 4 modulate L/R VCAs.
Walkthrough
  1. Press the central mode button until the yellow QUAD LED lights up.
  2. Set Slider 1 (master rate) to a slow position — around the 0.5 Hz mark.
  3. Leave Sliders 2/3/4 around mid (these set per-channel amplitude in QUAD mode).
  4. Patch Batumi SINE 1 → Filter L Cutoff CV input.
  5. Patch Batumi SINE 3 → Filter R Cutoff CV input (this output is 180° out of phase with SINE 1).
  6. Patch Batumi SINE 2 → VCA L CV; SINE 4 → VCA R CV.
  7. Send your stereo source through Filter L → VCA L and Filter R → VCA R.
Signal out Four jacks — SINE 1/2/3/4 — each -5V to +5V bipolar sine at the same master rate, staggered 0°/90°/180°/270°.
Listen for A wide swirling stereo filter motion: the left side opens as the right closes. SINE 2/4 add a slow tremolo offset between the two sides. Slow Slider 1 to taste; raise Sliders 2/3 to deepen the per-side amplitude.
▸ Show diagram
Patch diagramPatch diagram with 5 modules and 4 connections. Modules: Batumi, Filter L, Filter R, VCA L, VCA R. Signals: 4 cv.BatumiFilter LFilter RVCA LVCA RMode: QUADSlider 1: slowSINE 1cvSINE 3cvSINE 2cvSINE 4cvCutoffcvCutoffcvCVcvCVcv11. 180° phasecv
★ Clocked polyrhythm LFO
DIVIDE mode locked to an external clock; SQUARE 2/3/4 fire polyrhythmic triggers, SINE 1 modulates a filter at the master rate.
Walkthrough
  1. Power off, install the rear jumper 8 to put RESET/SYNC 1 into SYNC mode (default from factory).
  2. Power on. Press the central mode button until the blue DIVIDE LED lights up.
  3. Set Slider 2 to /2, Slider 3 to /3, Slider 4 to /8 (read divisions on the right-hand slider scale).
  4. Patch your master clock → Batumi RESET/SYNC 1. Slider 1 now follows the clock as master rate.
  5. Patch Batumi SQUARE 2 → Drum A trigger input.
  6. Patch Batumi SQUARE 3 → Drum B trigger input.
  7. Patch Batumi SQUARE 4 → Drum C trigger input.
  8. Patch Batumi SINE 1 → Filter Cutoff CV.
Signal out SQUARE 2/3/4 — -5V to +5V tempo-locked square waves at master/2, /3, /8 (use as gates/triggers). SINE 1 — -5V to +5V sine at the master rate.
Listen for Three tempo-locked drum patterns running at /2, /3, /8 against your clock — a steady polyrhythm that locks tightly to the master tempo, with the filter breathing once per master cycle.
▸ Show diagram
Patch diagramPatch diagram with 6 modules and 5 connections. Modules: Batumi, Clock, Drum A, Drum B, Drum C, Filter. Signals: 1 cv, 3 trigger, 1 clock.BatumiClockDrum ADrum BDrum CFilterMode: DIVIDEJumper 8: SYNCSlider 2: /2Slider 3: /3Slider 4: /8RESET/SYNC 1clkSQUARE 2trigSQUARE 3trigSQUARE 4trigSINE 1cvOutclkTrigtrigTrigtrigTrigtrigCutoffcvcvtriggerclock
Stacked complex LFO
PHASE mode · self-patch SINE 2 into the FRQ·PH·DIV 3 jack so one LFO modulates another's phase, producing evolving composite waveforms.
Walkthrough
  1. Press the central mode button until the yellow PHASE LED lights up.
  2. Set Slider 1 (master rate) to a slow position — around 0.1 Hz for drone use.
  3. Set Slider 2 to roughly 90°, Slider 3 to roughly 180° (read phase on the middle slider scale).
  4. Patch Batumi SINE 2 → Batumi FRQ·PH·DIV 3 (self-patch — SINE 2 now CV-modulates the phase of CH 3).
  5. Patch Batumi SINE 3 → VCA CV on a drone voice.
  6. Patch Batumi SINE 4 → Filter Cutoff.
Signal out SINE 3 — -5V to +5V composite waveform (no longer a pure sine — phase is being modulated). SINE 4 — -5V to +5V phase-shifted sine at master rate.
Listen for SINE 3 takes on a non-sinusoidal, evolving shape that drifts as Slider 2's offset and the self-patch interact. Use as a drone modulator: the VCA gain warbles in unfamiliar contours while the filter pans more predictably.
▸ Show diagram
Patch diagramPatch diagram with 3 modules and 3 connections. Modules: Batumi, VCA, Filter. Signals: 3 cv.BatumiVCAFilterMode: PHASESlider 2: 90°Slider 3: 180°FRQ·PH·DIV 3cvSINE 2cvSINE 3cvSINE 4cvCVcvCutoffcv11. self-patch phase modcv
★ V/oct LFO pitch tracking
FREE mode · keyboard V/oct into FRQ 1 lets CH 1 track pitch up to ~500 Hz — use as a tracked vibrato source or a tracked audio-rate FM modulator.
Walkthrough
  1. Press the central mode button until the red FREE LED lights up.
  2. Set Slider 1 to mid (the per-channel base rate for CH 1 in FREE mode).
  3. Patch your keyboard / sequencer Pitch CV → a stackable / mult.
  4. From the mult: one copy → Batumi FRQ 1 (CH 1 now tracks pitch 1V/oct).
  5. From the mult: another copy → VCO V/Oct.
  6. Patch Batumi SINE 1 → VCO FM input (linear or expo).
Signal out Batumi SINE 1 — -5V to +5V sine whose frequency tracks pitch (slider sets base rate, +5V at FRQ 1 pushes up into audio range, ~500 Hz max).
Listen for At low slider values, a vibrato that stays musically consistent across the keyboard — it does not get faster relative to pitch as you play higher. Push slider toward audio rate for chime-like FM sidebands that scale with the played note.
▸ Show diagram
Patch diagramPatch diagram with 3 modules and 3 connections. Modules: Batumi, Keyboard, VCO. Signals: 1 cv, 2 pitch.BatumiKeyboardVCOMode: FREESlider 1: midFRQ 11v/octSINE 1cvCV1v/octFMcvV/Oct1v/octcvpitch
Pause-and-reverse performance
QUAD mode · manual gate into RESET/SYNC 2 pauses all LFOs while held; trigger into RESET/SYNC 3 reverses direction — both jacks only active in synced modes.
Walkthrough
  1. Press the central mode button until the yellow QUAD LED lights up.
  2. Set Slider 1 to a moderate rate — around 1 Hz so the freeze is audible.
  3. Patch a manual gate source (footswitch, button, or held gate) → Batumi RESET/SYNC 2 (pauses all four LFOs while high).
  4. Patch a separate manual trigger → Batumi RESET/SYNC 3 (reverses LFO direction on each trigger).
  5. Patch Batumi SINE 1 → Filter Cutoff.
  6. Patch Batumi SINE 2 → VCA CV.
  7. Confirm QUAD LED is still lit — these aux jacks do nothing in FREE mode.
Signal out SINE 1 / SINE 2 — -5V to +5V sines at master rate. Output voltage freezes in place while RESET/SYNC 2 is high; direction inverts on each RESET/SYNC 3 trigger.
Listen for Hit the gate and the modulation freezes mid-sweep — a sudden glitch hold. Tap the reverse trigger and the filter swell crests, retreats, and rebuilds in retrograde. Great for performance stutters and palindrome swells.
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 4 connections. Modules: Batumi, Button, Filter, VCA. Signals: 2 cv, 1 gate, 1 trigger.BatumiButtonFilterVCAMode: QUADRESET/SYNC 2gateRESET/SYNC 3trigSINE 1cvSINE 2cvGategateTrigtrigCutoffcvCVcv121. pause2. reversecvgatetrigger
Drone with trapezoid gates
DIVIDE mode · SAW/ASGN outputs jumpered to trapezoid become four staggered VCA gates — a self-running polyrhythmic crossfade for drone voices.
Walkthrough
  1. Power off. Set the rear ASGN jumper cluster 9 to TRAPEZOID (per fig. 2 on the back of the module).
  2. Power on. Press the central mode button until the blue DIVIDE LED lights up.
  3. Set Slider 1 to a slow rate (e.g. 0.05 Hz). Set Slider 2 to /2 and Slider 3 to /3 (Slider 4 to /8 for an even longer cycle).
  4. Patch Batumi SAW/ASGN 1 → VCA 1 CV.
  5. Patch Batumi SAW/ASGN 2 → VCA 2 CV.
  6. Patch Batumi SAW/ASGN 3 → VCA 3 CV.
  7. Patch Batumi SAW/ASGN 4 → VCA 4 CV.
  8. Patch VCO 1 Out → VCA 1 In; VCO 2 Out → VCA 2 In; repeat for all four drone voices.
  9. Sum VCA outputs into a stereo mixer.
Signal out SAW/ASGN 1–4 — -5V to +5V trapezoid gates, each at master rate divided per slider. Use the positive half-swings as VCA gates.
Listen for Four drone voices crossfade in slow polyrhythmic waves — each takes the spotlight at its own division of the master, with smooth trapezoid edges instead of hard gates. A self-evolving drone with no external sequencer.
▸ Show diagram
Patch diagramPatch diagram with 7 modules and 6 connections. Signals: 2 audio, 4 cv.BatumiVCA 1VCA 2VCA 3VCA 4VCO 1VCO 2Mode: DIVIDEASGN: TrapezoidSlider 2: /2Slider 3: /3SAW/ASGN 1cvSAW/ASGN 2cvSAW/ASGN 3cvSAW/ASGN 4cvCVcvInaudioCVcvInaudioCVcvCVcvOutaudioOutaudioaudiocv
Phase-sweep chorus
PHASE mode · CH 1 driven into audio range via V/oct on FRQ 1; a slow external LFO sweeps phase on CH 2; sum the four sines for a phase-shifter-style chorus.
Walkthrough
  1. Press the central mode button until the yellow PHASE LED lights up.
  2. Set Slider 1 high (toward 100 Hz) to start near audio rate.
  3. Patch Pitch CV → Batumi FRQ 1 (1V/oct, +5V pushes CH 1 well into audio range, up to ~500 Hz). Above 100 Hz the manual notes that amplitude and waveform precision degrade — embrace it.
  4. Set Slider 2 to ~90°, Slider 3 to ~180°, Slider 4 to ~270°.
  5. Patch a slow external LFO → Batumi FRQ·PH·DIV 2 (CV-modulates CH 2's phase shift).
  6. Patch SINE 1 → Mixer In 1; SINE 2 → Mixer In 2; SINE 3 → Mixer In 3; SINE 4 → Mixer In 4.
  7. Listen to the mixer sum.
Signal out Mixer sum — four -5V to +5V sines at the same audio frequency, three of them with phase offsets that sweep slowly around CH 2.
Listen for A hollow, comb-filtered chorus tone on the summed output — as the slow LFO walks CH 2's phase, the cancellations and reinforcements between the four sines move, producing a phase-shifter-style sweep on the composite waveform.
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 6 connections. Modules: Batumi, Pitch CV, Slow LFO, Mixer. Signals: 4 audio, 1 cv, 1 pitch.BatumiPitch CVSlow LFOMixerMode: PHASESlider 1: high (audio rate)FRQ 11v/octFRQ·PH·DIV 2cvSINE 1audioSINE 2audioSINE 3audioSINE 4audioOut1v/octOutcvIn 1audioIn 2audioIn 3audioIn 4audio11. phase sweepaudiocvpitch
Tap-tempo modulation bank
Jumper 8 = SYNC · manual tap on RESET/SYNC 1 sets master tempo; DIVIDE mode fans that tempo into four locked modulation voices.
Walkthrough
  1. Power off, confirm the rear jumper 8 is installed (SYNC mode — this is the factory default).
  2. Power on. Press the central mode button until the blue DIVIDE LED lights up.
  3. Patch a tap button (or footswitch) → Batumi RESET/SYNC 1. Tap a steady tempo to set the master rate.
  4. Set Slider 2 to /2, Slider 3 to /3, Slider 4 to /8 to spread divisions across the channels.
  5. Patch Batumi SINE 1 → Delay Time CV (modulates at the tap rate).
  6. Patch Batumi SINE 2 → Filter Cutoff (half-time sweep).
  7. Patch Batumi SQUARE 3 → Envelope Trig input (third-time gate).
  8. Patch Batumi SAW/ASGN 4 → Pan CV (eighth-time slow pan).
Signal out SINE 1 — -5V to +5V sine at tap rate. SINE 2 — at tap/2. SQUARE 3 — -5V to +5V square at tap/3. SAW/ASGN 4 — at tap/8.
Listen for One tap, four tempo-locked modulation voices: delay time wobbles in time, filter sweeps every other beat, an envelope retriggers every third tap, and the pan crawls across the stereo field once per eight taps.
▸ Show diagram
Patch diagramPatch diagram with 6 modules and 5 connections. Modules: Batumi, Tap Button, Delay, Filter, Envelope, Pan. Signals: 3 cv, 1 trigger, 1 clock.BatumiTap ButtonDelayFilterEnvelopePanMode: DIVIDEJumper 8: SYNCRESET/SYNC 1clkSINE 1cvSINE 2cvSQUARE 3trigSAW/ASGN 4cvGateclkTimecvCutoffcvTrigtrigCVcvcvtriggerclock

Behaviors

FREE mode mode button · red FREE LED

All four LFOs run independently. Each slider sets its own channel's frequency from 0.01Hz to 100Hz. Each FRQ CV input is 1V/oct on its own channel. RESET/SYNC 2–4 inputs are inactive.

QUAD mode mode button · yellow QUAD LED

CH 1 is master frequency. CH 2–4 sines run at master rate but phase-shifted 90°/180°/270°. Sliders 2–4 set per-channel amplitude, and FRQ·PH·DIV 2–4 CV inputs modulate amplitude.

PHASE mode mode button · yellow PHASE LED

CH 1 is master frequency. Sliders 2–4 set arbitrary phase shifts (0°–360°) for channels 2–4. CV inputs modulate phase. Patching a Batumi LFO into another channel's phase input creates complex composite waveforms.

DIVIDE mode mode button · blue DIVIDE LED

CH 1 is master frequency. Sliders 2–4 select a division of master cycle: ÷2, ÷3, ÷4, ÷8, ÷16, or ÷32. CV inputs modulate the ratio. Extends effective low end to 28 hours per cycle with V/oct on CH 1.

Zoom mode hold mode button ~1s · current mode LED blinks

Fine-adjust mode. Slider travel is remapped around the current value for precise tuning. In DIVIDE mode, zoom adds ±0–3 to the base division. Exiting zoom with a slider position mismatch leaves the LED flashing until slider catches up.

Reset vs Sync jumper rear jumper 8 · or Poti switch

Selects behavior of RESET/SYNC 1 input. Jumper removed = RESET (hard-sync cycle to 0 on trigger). Jumper installed = SYNC (slave frequency to external clock, phase-aligned). Same choice is available live from the Poti expander.

Assignable waveform jumpers rear jumper cluster 9

Configures the SAW/ASGN output shape. Stock firmware offers saw-up, saw-down, triangle, trapezoid. Jumper pattern on the cluster picks one as default on power-up. Mode-switch or RESET/SYNC 4 in synced modes resets/advances selection.

Synced-mode auxiliary triggers RESET/SYNC 2–4 while in QUAD / PHASE / DIVIDE

When any synced mode is active, the three normally-idle RESET/SYNC jacks become global modifiers: #2 pauses all LFOs, #3 reverses direction, #4 advances to the next assignable waveform. All four channels respond simultaneously.

Extended frequency via CV CV into FRQ input · 1V/oct response

Slider sets only the base rate (0.01Hz–100Hz). Feeding -5V to +5V on the FRQ input expands the overall range to 500Hz on the top end and, via DIVIDE mode stacking, down to one cycle per 28 hours. Above ~100Hz amplitude and shape precision degrade.

Alternate firmware option firmware reflash via miniUSB

Xaoc publishes an alternate firmware with different waveform banks and interaction behavior. Flash is done through the miniUSB port 10 with the UPDATE jumper 11 in the correct position. Manual's stock firmware is 1974/5.3.

Poti / Samara expanders rear connector to Poti or Samara II

Poti breaks out the rear jumper settings (reset/sync choice, assignable waveform selection) to front-panel switches. Samara II adds attenuation, inversion, offset, mixing, min/max, and waveshaping across four channels for processing Batumi outputs.

Controls

CH 1 Slider 1 In FREE mode sets CH 1 frequency. In QUAD / PHASE / DIVIDE modes sets master frequency for all four channels.
0.01Hz – 100Hz · master in synced modes
CH 2–4 Slider 2–4 Role depends on global mode. FREE: per-channel frequency. QUAD: per-channel amplitude. PHASE: per-channel phase shift (0°–360°). DIVIDE: per-channel division of master (÷2, ÷3, ÷4, ÷8, ÷16, ÷32).
mode-dependent · zoom scales travel around current value
Global Mode button Central button cycles sync mode: FREE (red) → QUAD (yellow) → PHASE (yellow) → DIVIDE (blue). Hold 1s to enter zoom mode for fine slider control.
short press: cycle mode · long press: toggle zoom

I/O

IN · 5

  • FRQ / FRQ·PH·DIV -5V to +5V · 1V/oct CV
    Per-channel CV input for the parameter that the corresponding slider controls in the current mode. On CH 1 this is always frequency; on CH 2–4 follows mode (frequency / amplitude / phase / division).
  • RESET / SYNC trigger / clock GATE
    Jumper- or Poti-selectable. RESET: hard-sync the LFO cycle to 0 on incoming trigger. SYNC: slave LFO frequency to external clock / tap tempo; waveform phase aligns to clock.
  • RESET / SYNC 2 gate GATE
    In QUAD / PHASE / DIVIDE modes only: gate holds (pauses) all four LFOs while high. Inactive in FREE mode.
  • RESET / SYNC 3 trigger GATE
    In QUAD / PHASE / DIVIDE modes only: trigger reverses the direction of all four LFO waveforms. Inactive in FREE mode.
  • RESET / SYNC 4 trigger GATE
    In QUAD / PHASE / DIVIDE modes only: trigger selects the next assignable waveform on all four saw/asgn outputs. Inactive in FREE mode.

OUT · 3

  • SINE 1–4 -5V to +5V
    Bipolar sine output per channel. In QUAD mode shifted 0°/90°/180°/270°; in PHASE mode shifted per slider 2–4.
  • SAW / ASGN 1–4 -5V to +5V
    Assignable waveform output. Default stock firmware: saw-up, saw-down, triangle, or trapezoid, selected via rear jumper cluster or Poti. Switches to next shape when RESET/SYNC 4 fires in synced modes.
  • SQUARE 1–4 -5V to +5V
    Bipolar square wave per channel. Tracks the same frequency/phase/division as the sine output.