Synthesizer Cartridge for the Atari 2600

Love this.

There's a sense in which this isn't the most practical choice -- general purpose synths (software or hardware) and libraries available for most runtimes give you all the power you need to create the bleeps and bloops.

But there's also something good about old things and limited things being put to good use, and finding ways for creativity to thrive in constraints.

For the record, the word "qotile" in the domain name is from the game Yars Revenge, one of the most fun (imo) games for the 2600:

https://en.wikipedia.org/wiki/Yars%27_Revenge

Nice, but without any "sync" capabilities unfortunately useless in a multi-instrument context.

His Cynthcart for the C64 is much better and more versatile, I use it often with a midi keyboard to make chiptunes.