Sickozell has a few modules that let you load your own samples to play: Sampler, Player, DrumPlayer… They are not 100% done (I have to add some right-click menu support) but close enough to be usable:
I de-prioritized the STSP a bit once I got the firmware to the point where it could run these modules. The main thing the STSP offers that can’t be done on any existing module is the ability to stream super long samples from disk (up to 4GB) since it has a fixed buffer size and loads from disk what it needs as it’s playing.