Sidekick64 SD-Image 0.48 (includes C128, C16/+4 versions)
This release includes a simplified MIDI emulation of Datel and Sequential MIDI interfaces, and a built-in SoundFont-synthesizer (using a slightly modified version of TinySoundFont: https://github.com/schellingb/TinySoundFont).
This allows you to play demos such as:
https://csdb.dk/release/?id=179366 and
https://csdb.dk/release/?id=176411
without any additional hardware besides the Sidekick64.