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Midi Record/Play/Overdub With 5-Pin Connections

Uses an ATMega-1284 chip running at 8 MHz, with 4 k Bytes of RAM and 4 kBytes of eeprom_
Uses the old DIN 5-pin connectors

Allows recording and playback, as well as overdub: recording along with something you recorded before.
Full menu

Capability of naming and storing a file in eeprom_
Editable tempos and time signatures

Rudimentary quantization_
Proof of concept: you may find this project challenging.

What this tutorial includes:
Parts list_
Project Report (Attached to this panel)

Contains a lot of info you need to know about the project
Link to the C code on GitHub_
Step-by-step instructions for building the project and adapting the code”

Link to article