doepfer-a-155-2

Doepfer A-155-2

Compact 8-step analog CV/Gate sequencer with ratcheting and 8 presets in 12HP

12 HP Eurorack module

The Doepfer A-155-2 is a miniaturized rework of the classic A-155 analog sequencer, packed into 12HP. It generates an 8-step CV and Gate sequence driven by an external clock. Each step has a dedicated CV knob and an illuminated step button that toggles the gate on/off and doubles as a programming surface for sequence length, running direction (8 modes including pendulum and random), per-step ratcheting (x2/x3/x4), and 8 user-recallable presets. CV output is non-quantized but switchable across 1V, 2V, or 4V ranges, with an internal MIDI pin header for driving an external MIDI-to-CV interface when quantized pitch is required.

Features

  • 8-step analog sequencer with simultaneous CV and Gate outputs
  • Per-step CV knob (1-8) with switchable 1V/2V/4V output range
  • 8 illuminated step buttons that toggle gate-on/gate-off per step
  • 8 running directions: Up, Down, 2x Up, 2x Down, Pendulum 1, Pendulum 2, 2x Pendulum, Random
  • Adjustable sequence length (1 to 8 steps) via Limit programming
  • Per-step ratcheting at x2, x3, or x4 multiplication
  • 8 user-recallable presets (gate pattern + length + direction + ratcheting)
  • External clock input (no internal clock generator); accepts up to >10kHz
  • External reset input with jumper-selectable polarity, edge/level, and reset mode
  • Internal MIDI pin header for driving an external MIDI-to-CV interface
  • Compact 12HP / 60.6mm / 50mm depth — successor to original 80HP A-155
  • Gate output 0V/+10V; CV output non-quantized analog

Controls & Jacks (26)

  • Step 1 CV
  • Step 2 CV
  • Step 3 CV
  • Step 4 CV
  • Step 5 CV
  • Step 6 CV
  • Step 7 CV
  • Step 8 CV
  • Step 1
  • Step 2
  • Step 3
  • Step 4
  • Step 5
  • Step 6
  • Step 7
  • Step 8
  • Range
  • Program
  • Ratcheting
  • Function
  • Sta/Stp
  • Reset
  • CV
  • Gate
  • Clock In
  • Reset In

How-To Guides

  • First patch — basic 8-step bassline
  • Shorten loop and explore directions
  • Add per-step ratcheting for groove
  • Save and recall a sequence preset
  • Graphic VCO trick — 8-step waveform at audio rate
  • Quantized pitch via internal MIDI header

Explore the interactive A-155-2 panel on BleepDex — tap any control to learn what it does.

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