I have recently built an Erica Synth DIY System and needed to program the Atmega328P for the module.
A friend on a Facebook group suggested to use a "regular" Arduino Uno Board that uses an Atmega328, and swap it with the one I needed to program.
Cool, good idea, but the MIDI-CV firmware ony comes in .hex format, so you cannot load it into the Arduino IDE. But there's a workaround using avrdude and "spying" what the Arduino IDE does when uploading.

Read more: Program Erica Synth MIDI-CV Atmega328 with Arduino

Here's quick walkthru of Patterns 01-64 of the Sonicware Liven 8bit Warps

I finally managed to find some time to solder Jasper MIDI interface and to host it into the mahogany case I started building last July.

Here's the result, not 100% perfect maybe but I am quite happy on how it turned out, those recessed MIDI connectors in particular ;-)

Read more: Jasper (Wasp Clone) with MIDI and wooden case

 I wanted to change the default look of all icons on MIDI studio on my Mac, and I found an easy way to customize them: