Session 17

Session 17: LFO Basics — 3 LFOs Per Track

20 min|intermediate|patch

Session 17: LFO Basics — 3 LFOs Per Track

Objective: Use the OT's three per-track LFOs to add automated movement. LFO1 modulates filter frequency for classic wobble. LFO2 modulates panning for stereo motion. Understand sync vs. free-running modes and trig vs. continuous behavior.

If you only have 5 minutes

Press [LFO]. Set DEST1 = FILTER FREQ, DEPTH1 = 60, SPEED1 = 16 (sync to 16th notes). Wave1 = SINE. You hear a wobble bass — instant dub. That's LFO1, used.

Warm-Up (2 min)

You've shaped sound, sequenced it, and added micro-feel. Now we add automated movement. Each track has 3 LFOs running in parallel — that's 24 modulation sources across an 8-track pattern. Press [PLAY] on your current pattern. Imagine: the filter on track 1 sweeping rhythmically, the panning on track 2 swirling, the delay time on track 3 wandering. All hands-free.

Setup

Start from the LAB project. Tracks 1-3 should have working content (drums + melodic). Track 1 should have a filter assigned to FX1 (Multi Mode Filter from Session 10) so we have a target. Press [PLAY] to confirm.

Exercises

Exercise 1: Open the LFO Page (3 min)

Each track has its own LFO page with 3 LFOs.

  1. Press [TRACK 1] to select your track
  2. Press [LFO] to open the LFO page (the Track Parameter page for LFOs)
  3. The screen shows 3 LFO rows, each with parameters:
    • WAVE (waveform: SINE, TRI, SQUARE, SAW, RAMP, EXP, RANDOM, NOISE)
    • SPEED (rate: 0-127. Free mode = absolute, sync mode = beat divisions)
    • DEPTH (modulation amount: -64 to +64 — bipolar)
    • DEST (destination parameter)
    • MODE (FREE, TRIG, HOLD, ONE)
    • MULT (speed multiplier)
DATA ENTRYTRACK PARAMSVOLUMEHP VOLLEVELOCTATRACKPTN A01 PART 1BPM 120.0Octatrack MKIIABCDEFPLAYSTOPRECTEMPOFUNCPROJPARTAEDMIXARRMIDISRCAMPLFOFX1FX2SCENE ASCENE BCROSSFADERREC1REC2REC3PTNBANKPAGEUPDOWNLEFTRIGHTYESNOT1T2T3T4T5T6T7T8CUETRIG 1TRIG 2TRIG 3TRIG 4TRIG 5TRIG 6TRIG 7TRIG 8TRIG 9TRIG 10TRIG 11TRIG 12TRIG 13TRIG 14TRIG 15TRIG 16

Exercise 2: LFO1 — Filter Wobble (5 min)

The classic dub filter wobble.

  1. On the LFO page for Track 1:
    • WAVE1 = SINE
    • SPEED1 = 16 (in sync mode = 16th notes)
    • DEPTH1 = 60
    • DEST1 = FX1 FREQ (the Multi Mode Filter cutoff)
    • MODE1 = FREE (LFO runs continuously, ignores trigs)
  2. Press [PLAY]. The kick now has a smooth filter wobble at 16th-note rate
  3. Try faster: SPEED1 = 8 (8th note wobble — more obvious). Or slower: SPEED1 = 32 (slow undulation)
  4. Try different waves:
    • SQUARE = stepped, on/off filter
    • SAW = ramp down then snap up — sounds like a slow tape stop loop
    • RANDOM = jittery, glitchy filter (S&H style)
  5. Adjust DEPTH1 to taste — +30 is subtle, +90 is dramatic, -50 modulates inversely

Exercise 3: LFO2 — Panning Movement (4 min)

Add LFO2 on top — they run independently.

  1. On the same LFO page (Track 1):
    • WAVE2 = SINE
    • SPEED2 = 4 (very slow, 4 beats per cycle)
    • DEPTH2 = 40
    • DEST2 = AMP BAL (panning balance)
    • MODE2 = FREE
  2. Press [PLAY]. The track now wobbles in filter AND drifts left-right in stereo
  3. Two modulation lines moving independently — already a much richer sound from one track

Exercise 4: LFO Modes — TRIG vs. FREE vs. HOLD (4 min)

The MODE parameter changes when the LFO restarts.

  1. Set MODE1 = TRIG. Press [PLAY]. The LFO restarts from phase 0 every time a trig fires
  2. Listen — every kick is in the same phase of the wobble (predictable, rhythmic)
  3. Now set MODE1 = FREE. The LFO runs continuously regardless of trigs — the wobble's phase relative to the beat drifts
  4. Set MODE1 = HOLD. LFO stops at its current value when no trigs are firing — useful for sample-and-hold style modulation
  5. Set MODE1 = ONE. Plays through one cycle on each trig, then stops — perfect for envelope-like ramps
  6. When to use which:
    • TRIG for tight, on-the-grid modulation (every kick gets the same wobble)
    • FREE for floating, ambient modulation (drifts)
    • HOLD for stepped sequences via S&H + RANDOM wave
    • ONE for one-shot envelope-like modulation per trig

Exercise 5: SPEED Sync vs. Free Mode (4 min)

Sync mode locks LFO speed to musical divisions; free mode is absolute Hz.

  1. Hold the SPEED1 knob (or look for a sync toggle on the LFO setup page — [FUNC] + [LFO])
  2. In sync mode (default), SPEED values represent musical divisions: 1=128th, 2=64th, 4=32nd, 8=16th, 16=8th, 32=quarter, 64=half, 128=whole
  3. Switch to free mode — SPEED is now in Hz. Useful for non-musical modulation (slow drift cycles, sub-audio rates)
  4. Try free mode SPEED = 1.5 Hz for a slow swelling motion that doesn't lock to the beat — feels organic, alive
  5. Rule of thumb: sync for rhythmic modulation, free for organic/ambient modulation

Exploration (if time allows)

  • Try LFO3 on FX2 MIX (delay wet level) — your delay swells in and out automatically
  • Set LFO1 + LFO2 to the same destination (FILTER FREQ) but different speeds and depths — complex compound modulation
  • P-lock the LFO depth or destination per step — the same LFO modulates different parameters at different sections of the pattern

Output Checklist

  • I assigned LFO1 to FX1 FREQ with sync speed and heard the wobble
  • I tried different waveforms (SINE, SQUARE, SAW, RANDOM) and described their character
  • I assigned LFO2 to AMP BAL for stereo panning movement
  • I tried all 4 LFO modes (FREE, TRIG, HOLD, ONE) and felt the difference
  • I switched between sync and free SPEED modes
  • I saved the project with at least 2 active LFOs

Key Takeaways

  • 3 LFOs per track = 24 modulation sources across an 8-track pattern. Use them all
  • DEST can target almost any parameter — filter, pan, delay time, volume, even other LFO speeds
  • MODE matters: TRIG for grid-aligned, FREE for drifting, HOLD for S&H, ONE for envelope-like
  • Sync vs. free SPEED: sync for musical rhythm, free for organic drift

Next Session Preview

Next: the LFO Designer. Draw your own 16-step custom waveshape. Assign it to sample START — the LFO scrubs through the sample. Combine with p-locks for deeply evolving textures. The OT's most distinctive modulation tool.