RandomVertebrate / raspi-looper

Easy 4 track looper for RaspBerry Pi

raspi-looper

Simple 4 track looper for Raspberry Pi. Uses pyaudio.

Hardware Setup

Components

• Raspberry Pi
• USB sound card
• 8 Buttons
• 8 LEDs
• Audio jacks, wires and connectors to taste

Connections

• Buttons and LEDs connect to GPIO.
• Sound card plugs into full-size USB port on Raspberry Pi.
• Looper input goes to sound card input AND to looper input 1 ("LIVE").
• Soundcard output goes to looper output 2 ("LOOPS").

See GPIO connections table and wiring diagram.

Software Setup

Basic

• Install pyaudio
• Uninstall pulseaudio
• Download this repository
• Set main.py to start on boot (run main.py as sudo)

Optional/Troubleshooting

• Uninstall unnecessary software, disable GUI (speed up boot time)
• Adjust sound levels in alsamixer (if signal is too quiet/loud)
• Turn off WiFi (reduce noise/interference)

User Manual

Begin Session

• Press Track 1 Record Button to start looping. Track 1 will start recording.
• Press Track 1 Record Button to stop recording. Track 1 will now loop.

During Session

• Press Record Button to arm a track for recording or overdubbing. Recording will start on the next loop of Track 1.
• Press Record Button again to stop recording or overdubbing.
• Press play button to mute or unmute track.
• While track is playing, hold Record button to undo last overdub.
• While track is muted, hold Record button to clear track.

After Session

• Hold Track 1 Play Button to start new session.
• Hold Track 2 Play Button to enter 'developer mode' (exit the looper script).