terrabite3 / ModularSampler

A Raspberry Pi-based sampler designed to integrate with a modular synthesizer

ModularSampler

A Raspberry Pi-based sampler designed to integrate with a modular synthesizer

Connections needed

• Audio input
• Audio output
• MIDI input (can be USB)
• MIDI output for sampling a MIDI synth (optional)
• CV, trig, gate output
• Some buttons and LEDs (optional)

Hardware needed

• RPi
• Audio Injector
• Audio level adapter (could be a separate module)
• Another board
  • Filter PWM from GPIO for CV
  • Buffer trig and gate from GPIO
  • Buttons and LEDs

MIDI CV mode

• MIDI notes produce CV/trig/gate output
• No recording or playback of audio

Record mode

• MIDI notes produce CV/trig/gate output
• MIDI note also starts audio recording
• Audio recording continues after MIDI note is released up to a certain time

Playback mode

• MIDI notes play back the previous audio recording
• No CV/trig/gate output

Autosample mode

• Define a note range, note length, and release length
• Produces CV/trig/gate output for each note in the range and records audio

TODO list

MIDI

• ✓ Get MIDI messages from USB

Audio out

• ✓ Get audio output through card
• ✓ Play audio from Python
• ✓ Load a sample
• Build an amplifier to get to eurorack levels

Audio in

• ✓ Get audio input through card
• ✓ Record audio from Python
• ✓ Save a sample
• Build an attenuator to get from eurorack levels

CV

• ✓ Generate digital output
• ✓ Generate PWM output
• ✓ Build a trigger out buffer
• ✓ Build a CV out buffer/filter

Integration

• ✓ MIDI to CV mode
• ✓ Record mode
• ✓ Playback mode
• Autosample mode
• Interactive application

Wishlist

• MIDI DIN input
• Custom hat PCB
• Build it into a eurorack module
• Port to RPi Zero
• All-button interface
• Velocity sampling