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ER-101: Indexed Quad Sequencer 
for Eurorack Modular Synthesizers

The ER-101 is a real-time composition, sequencing and automation environment, all in 26HP. It enables you to compose sequences of thousands of steps with variable duration, variable gate length, arbitrary scales, smooth transitions, save/recall device state and much more. 

- 4-track sequencer
- stepped and smooth voltage transitions
- each track has 3 outputs: 2 CVs + 1 gate
- each track has its own adjustable loop points 
- each track contains up to 100 patterns  and each pattern can contain up to 100 steps
- each step can be individually adjusted to have 0-99 clock cycles in duration
- each gate can be individually adjusted to have 0-99 clock cycles in duration with or without ratcheting
- configure each track to output gates or triggers 
- configure each track to have its own clock multiplier (1x to 99x)
- CVs are chosen (indexed) from voltage tables of which there are 2 per track (A & B)
- 8 built-in and 8 user reference voltage tables for initializing the track tables
- voltage tables are user-editable and have 100 entries per table
- voltages between 0.000-8.192V at 2mV increments can be dialed in 
- each voltage table can be configured to use note display or numeric display
- smoothing can be enabled for individual steps, entire patterns and/or entire tracks 
- smoothed transitions are NOT simply slews but are adjusted to match the current tempo in real-time
- hold feature (complete double-buffering of device state) allows you to edit-and-commit on the beat while the sequencer is running 
- while in hold mode, committing changes to a running sequence can be either immediate or quantized to the beat
- reset can be either immediate or quantized to coincide to with the ending of the current track, pattern, or step
- stores up to 16 snapshots of the state of the entire device
- arbitrary insert/delete of patterns/steps with clipboard style copy/paste 
- math button allows you to specify a mathematical operation to apply to a step, a pattern or a track.
- note repeat (aka ratchet) any step
- shuffle (aka swing) any step
- expansion port 
- last saved snapshot is loaded automatically on power-up
- firmware upgradeable via USB
- expander available: ER-102

Also comes in 3 flavors to match your taste! See panel options here.

Width: 26hp 
Depth: 30mm from the back of the faceplate including the ribbon cable
Current Consumption: 
(There is a switch on the back that lets you choose the +5V source.)
  • If +5V source is internal REGulator then approx 120mA from +12V.
  • If +5V source is the BUS then approx 95mA from +5V and 25mA from +12V.
Digital Inputs: x2 (clock and reset, threshold=2.5V)
Digital Outputs: x4 (gates or triggers, LOW < 0.1V and HIGH > 9.5V)
Analog Outputs: x8 (output range: 0-8.192V)
  • Serial Numbers A-XXX through F-XXX: Units built before Dec 2014 have 12-bit resolution (4096 levels)
  • Serial Numbers G-XXX and after:  Units built after Dec 2014 have 14-bit resolution (16384 levels)
  • Output impedance is 0.5 ohms with maximum current clamped at 8mA
Latest Firmware Version: v2.04
Max Total # of Patterns: 400 per snapshot
Max Total # of Steps: 2000 per snapshot

** Some details might change without notice.

Official Manual
User manual for firmware v2.09: Download

Here is a diagram of the first 7 steps of the melody in Faltermeyer Switch video.

User Videos