I found all the parts to a DIY Music Synthesizer – The ArduTouch Music Synthesizer by Cornfield Electronics. It uses an Arduino UNO type microprocessor. I bought the kit in 2017. I got the decent Soldering Station so I was ready to put it together. I ran to the web page for the ArduTouch and got the assembly instructions. So – Here is the finished results:
I should emphasize that this is an Arduino UNO type setup, the board is different, but it does use the same Atmel ATmega328P main chip. It makes rather interesting sounds. The default synth program is called Thick. There are several other programs in the github repository.