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TapeLooper

DSP Library Checks Firmware Checks And Builds Formatting

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

panel design

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