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: 2cm from the back of the faceplate 
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 v2.04: Download View

Past Manuals
User manual for firmware v2.02 - v2.03: Download View
User manual for firmware v1.04 - v1.06: Download View
User manual for firmware v1.07 - v1.08: Download View
User manual for firmware v1.09: Download View
User manual for firmware v1.10-v1.12: Download View


International (non-Japan) Buyers
Payment via PayPal/Credit Card only
Price: $600 (includes shipping to anywhere in the world via EMS)
  • If there is stock, I will ship your module within business days via EMS which then takes about 4-5 business days to arrive at most places in the world. Please read our shipping policy for more details. 
  • See panel options here.
  • BEFORE YOU PURCHASE, KNOW YOUR COUNTRY'S TAX & DUTY RATES!  You are responsible for any import taxes or other duties that may be charged by the customs and postal services of your country. 
Chooose your panel

Domestic (Japan) Buyers
Option A: Payment via 振込み(FURIKOMI)
Price: 58,000円 (includes shipping and sales tax)
Send your order using this contact form.
Option B: Payment via PayPal/Credit Card
Price: 60,000円 (includes shipping and sales tax)
See panel options here.
Choose your panel

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