ER-301: Sound Computer

SampleStack supported

Orthogonal Devices

A fully programmable DSP canvas for building custom samplers, granular engines, and effects.

Format

Eurorack, 30 HP

Sample Rate

Up to 96 kHz

Bit Depth

16/24/32-bit float (converted to 32-bit float in RAM)

Channels

Mono or Stereo

File Formats

WAV (uncompressed)

Storage

2x MicroSD slots: front (user data) and rear (system)

Specifications

Memory	512 MB RAM (~480 MB available for samples)
Power	~500 mA (+12V), ~100 mA (-12V)

Features

Fully programmable DSP canvas with on-screen unit blocks
4 audio inputs, 4 audio outputs, 20 CV inputs, 4 gate inputs
Up to 12 simultaneous audio/CV recording tracks
USB mass storage mode for direct computer access (v0.6+)
Build custom samplers, granular engines, loopers, effects, synth voices

Folder Structure

Front microSD Root (FAT32, 32 GB max)/
├── ER-301/
│   ├── sc/
│   │   └── quicksaves/
│   └── <version>/
│       └── presets/
├── Samples/
│   ├── Drums/
│   │   ├── kick.wav
│   │   └── snare.wav
│   └── Loops/
└── (any other user folders)

Notes

No mandatory folder structure for samples; organise freely
Accepts uncompressed WAV at any sample rate, 16-bit, 24-bit, or 32-bit float
System folders (ER-301/) are auto-created. Do not delete or rename them
Front card accessible via USB mass storage or by physically removing the card
Class 10 / UHS-1 or faster recommended; UHS-3 for 6+ simultaneous recording tracks at 96 kHz

Preparing samples for the ER-301: Sound Computer

The Orthogonal ER-301 is the opposite of strict. It accepts uncompressed WAV at any sample rate and 16, 24, or 32-bit float, mono or stereo, converting everything to 32-bit float in RAM, and it imposes no folder structure on your samples, so you can organize them however you like on the front card.

The two things to respect are the auto-created ER-301 system folders, which should not be renamed or deleted, and card speed: a Class 10 or faster card, UHS-3 if you plan to record six or more tracks at 96 kHz. SampleStack converts and organizes a library onto the front card so the ER-301's sample units find it, without fighting a naming scheme that does not exist.

Frequently Asked Questions

What sample format does the ER-301 use?

WAV up to 96 kHz at 16, 24, or 32-bit float, mono or stereo. It converts audio to 32-bit float in RAM. User samples live on the front microSD card (FAT32).