CVSeq

CVSeq screenshot

CVSeq is a clocked dual-channel CV/note sequencer with a shared pool of 32 CV values. Each channel has its own step list; each step picks a value from the pool and lasts a configurable number of clocks (with a half-clock option for ratchets/swing). Output 1 plays channel 1 (quantized, with optional CV1/CV2 transpose); Output 2 can play channel 2 or mirror channel 1 at various octave offsets. Both channels have independent loop regions, toggleable on the fly.

I/O

  1/3 2/4
TRIG Clock (timebase) Reset
CV INs CV1 (transpose / pitch base for channel 1) Per In2 mode (CV2 input or CV1 transpose)
OUTs Channel 1 CV (quantized) Per Out2 mode

Screens

The cursor traverses four screens in order: Main (modes, quantizer, transpose, reset/random, loop toggles), Values (edit the shared CV pool), Channel (per-channel step editor), General (CH1↔CH2 copy). A header on every screen shows both channel playhead positions and a 4-clock bar counter (one tick per half-clock, dotted at each whole clock); channel bars scale to Num steps and pin to full when a loop pulls playback past that length.

Pressing AUX while on most editable fields (CV/Note on Values; Num steps/Step/Value/Loop/Clocks on Channel) toggles a quick mode that scrubs the index without leaving the field.

In2 (CV2 input) modes

Mode Description
CV2 CV2 is the pitch base for channel 2 (added before the channel 2 sequence value, then quantized).
Trnsp CV2 transposes channel 1 in semitones. See Quantizer & transpose for Deg/Root behaviour.

Out2 modes

Out2 Mode Description
CV2 Channel 2 sequencer output (quantized, using CV2 as pitch base when In2 = CV2)
CV1±2 / CV1±1 / CV1 Channel 1 output, transposed by ±2 / ±1 / 0 octaves
Gate Short gate at each new channel 1 step
CV1in CV1 input passed through (unquantized, not transposed)

Quantizer & transpose

Both channels share one quantizer (Q1–Q8), with an OFF setting one click below Q1 that bypasses quantization (CV1/CV2, sequence values, and transpose are summed and output chromatically). The quantizer field shows the current scale and root; pressing AUX on it opens the global quantizer editor for that channel (works in OFF mode too, so you can prep before switching back).

The transpose-mode toggle controls how CV1-transpose (and the manual root note when no scale is selected) is applied:

  • Deg: added before quantization, snapping to a scale degree.
  • Root: added after quantization, staying chromatic (manual root-note offset, matching TB3PO).

Values screen

The shared pool holds 32 CV values, indexed 1–32. Each step on either channel points at one of these; editing a value changes every step that references it.

  • Value index — selects which value (1–32) to edit.
  • CV — value as voltage. Each increment is half a semitone (50¢, ~0.042 V), giving a ±63.5-semitone range.
  • Note — same value as a chromatic note name + octave (signed, e.g. B-1). Odd values append +50c to indicate a quarter-tone — useful as a chromatic detune that survives quantization.
  • 0 / Cpy / Past — reset the current value to 0 V, copy to clipboard, paste from clipboard.

Channel screen

Per-channel step editor.

  • CH — selects channel 1 or 2. Pressing AUX here toggles channel-follow: the step cursor tracks live playback (channel label highlights when active).
  • Num steps — active sequence length (1–64). Steps beyond this are kept in memory but ignored unless a loop pulls them in.
  • Step (#) — which step you’re editing.
  • Value (val #) — index into the shared CV pool (1–32).
  • Loop — region bounded by > (lower) and < (higher) markers. Pressing the encoder snaps the closer marker onto the current step: extends the region from outside, contracts the nearer side from inside, collapses to a single step when on a marker. Markers can land anywhere from 1 to 64.
  • Clocks — step length. 32 values: a half-clock 1/2 for ratchets/swing, then 1–31 whole clocks. Pairs of consecutive 1/2 steps fit inside a single clock; a trailing odd 1/2 run is auto-extended so the next step starts on a clock boundary.
  • Bottom row — total length of the active sequence (whole clocks), then when the current step starts. A trailing / means a half-clock boundary (e.g. 5/ is five-and-a-half clocks in); - means the step is past num_steps.

General screen

  • CH1 > CH2: copy channel 1 (steps, length, loop) onto channel 2.
  • CH2 > CH1: copy channel 2 onto channel 1.

Loops

Each channel has an independent loop region. On the main screen, ch1 / ch2 toggle the loop for that channel; Flp toggles both at once (useful for swapping which channel is looping).

Loop changes are clock-locked — they take effect on the next whole clock so swaps stay musical. Toggling again before the next clock cancels the pending change; editing the endpoints re-anchors the phase reference; a reset applies the current state immediately and clears any pending toggle.

  • Engaging from outside the region: snaps to the position the loop would be playing if it had been running since reset (phase-locked re-entry).
  • Engaging from inside: leaves the playhead where it is.
  • Disengaging: continues from where the un-looped sequence would have been (the loop is treated as a detour, not a reset).

Random

Selecting Random on the main page opens a checklist-style randomizer:

  • CH1 / CH2: per-channel checkboxes — only checked channels are affected by Steps (Init / Zero always reset both).
  • Values: randomize the entire CV pool within ±18 semitones (whole semitones).
  • Transpose: randomly transpose ~half of the CV values up or down by up to 6 semitones.
  • Steps: regenerate the step list for each enabled channel with random clocks-per-step (mostly 4, some 2) and random value indices. CH1 targets 16 clocks (occasionally 8 or 32); CH2 is the same, half, or a quarter. Loops are cleared.
  • Zero: clear all CV values to 0, reset both channels to a single empty step, clear loops.
  • Init: load the default init sequence (root / 4th / 5th–driving techno pattern, CH1 = 3 steps, CH2 = 2 steps), and refill the CV pool with that interval set.
  • Back: exit without changes.

Reset

Resetting (digital 2 trigger or pressing Reset on the main page) is latched: the current step keeps playing until the next whole clock, then both channels jump back to step 0. This keeps Reset musical when fired off-grid.

Persistence

⚠️ Step data is not saved across power cycles. Saved presets store only configuration (In2/Out2 modes, quantizer selection including OFF, transpose mode, random checkbox state). The CV pool, step list, sequence lengths, and loop points all reset to the default Init pattern on power-up or preset reload.

Credits

Authored by Daniel Gorgan