TapeLooper

A digital tape looper module for Eurorack or standalone use, built on the Daisy Seed.

Features

• 4 stereo or mono tape loop channels - record and play back independent, unsynchronized tape loops
• Motor simulation - playback speed ramps up and down with a configurable rate
• Tape simulation - with drive, grain and warble independently controllable
• Variable playback speed - with Volt/Octave CV control and quarter/half/double/quad speed
• Forward and reverse playback
• Amplitude CV control
• Clean recording — audio records cleanly into loop channels; tape simulation is applied during playback only
• Perfect loop recording - with a small crossfade at the loop point
• SD card storage - save and load loops as 48kHz stereo WAV files

Hardware

Based on the Electrosmith Daisy Seed. Designed to operate as either a Eurorack module or a standalone desktop unit.

Project Structure

• dsp/ — DSP library: audio processing, loop playback/recording, tape simulation
• firmware/ — Target firmware: main application, UI, SD card I/O
• hardware/ — KiCad PCB designs and panel artwork
• lib/ — External dependencies
• scripts/ — Development helper scripts

Development

Requirements

• CMake 3.30+
• clang++ (C++17) for building and running unit tests
• arm-none-eabi-gcc 10-2020-q4 recommended for cross-compiling firmware to the Daisy Seed
• Python 3 with pip (for pre-commit hooks)

Unit Tests

Tests are written with Google Test. Build and run from the respective tests/ directories:

# DSP library tests
cd dsp/tests && make test

# Firmware tests
cd firmware/tests && make test

Pre-commit Hook

A pre-commit hook runs clang-format on staged files before each commit. To install:

./scripts/setup-clangformat-precommit-hook.sh