4ms-catalyst-sequencer

4ms Catalyst Sequencer

Eight-channel phase-scrubbing CV and gate sequencer

20 HP Eurorack module

The Catalyst Sequencer is an eight-channel precision CV/gate sequencer that operates simultaneously as a traditional clocked step-sequencer and an advanced phase-based sequencer. Its crossfader and Phase CV input allow continuous scrubbing through sequences, enabling everything from tight rhythmic patterns to fluid, tape-like playback controlled by external waveforms. Each of the eight channels can independently output CV or gates with per-channel overrides for length, direction, phase, transpose, clock division, and randomization.

Features

  • Eight precision CV/gate output channels, each independently configurable
  • Sequences from 1 to 64 steps, organized into eight pages of eight steps each
  • Phase-based sequencing: Phase CV input (0-5V) and crossfader scrub through sequence continuously
  • Clock-driven sequencing: Clock In jack advances sequence on rising edge
  • Crossfader and Phase CV, clock counts, and Phase parameter are summed for position
  • Per-channel overrides for Start, Length, Direction, Phase, Transpose, BPM/ClockDiv, and Random
  • CV output range -5V to +10V, constrainable per channel to +/-5V, +5V, +3V, or +1V
  • 14 factory quantization scales plus eight custom scale slots (firmware v1.3+)
  • Custom scales support up to 21 notes, not limited to semitones or octave-based repetition
  • Gate mode with per-step pulse width control, ratchet (1-4 pulses), and swing (forward/backward timing offset)
  • CV mode glide (glissando) per step, from 0 to 100%
  • Per-step probability of random variation (0% to 93.75%)

Controls & Jacks (34)

  • Clock In
  • Output 2
  • Output 4
  • Output 5
  • Output 7
  • Phase CV
  • Output 1
  • Output 3
  • Reset
  • Output 6
  • Output 8
  • Dir.
  • Phase
  • Range
  • Transpose
  • Start
  • Length
  • Phase Scrub
  • Copy
  • Shift
  • Page 1
  • Page 2
  • Page 3
  • Page 4
  • Tap Tempo
  • Play/Reset
  • Glide
  • Chan.
  • Page 5
  • Page 6
  • Page 7
  • Page 8
  • BPM/Clock Div
  • Random

How-To Guides

  • Saving a Sequence to a Slot
  • Loading a Sequence from a Slot
  • Clearing a Single Channel
  • Factory Reset (Clear All Channels)
  • Saving a Custom Scale
  • LFO-Driven Melodic Sculpting
  • Polyrhythmic Gate Network
  • Live Tape-Scrub Performance
  • Probabilistic Melody with Controlled Chaos
  • Song Mode Live Arrangement
  • Paired CV and Gate Channels
  • Eight-Channel Modulation Network

Explore the interactive Catalyst Sequencer panel on BleepDex — tap any control to learn what it does.

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