I had several ideas of how to do a multi-system chiptune synth but none of it seemed viable for one reason or another. But about two years ago, I decided I finally had a clue and wanted to build a synthesizer a certain way. Through a little bit of life turmoil, I finally got  things working:

At that point the signalling was working but I needed to write software. I made a post about that here and included some screenshots of the state of the software while working on it:

Development progressed and I made a little video describing the project and haphazardly demonstrating it:

Life sure does love to get in the way of work, but things have steadily improved as time has gone on. There are more progress reports on my Patreon and more of the videos on youtube, but basically we've ended up here:

Time is currently being spent implementing support for more sound chips, improving the overall playback code, and writing more file format filters.

Please feel free to discuss here on hackaday.io!