Thanks, it's pretty fun to work on! At the moment I'm not planning on adding sampling support but it could be something I will consider in the future.
There are two ways around it, one would be to bake the samples in the rom file, either at compile time or with an injector of sorts. The other would be to keep the samples on the save file. Both of these need extra tooling in addition to the work it's required to make it work on the sequencer side.
This can be a lot of extra work and unfortunately my time is limited and this project is not yet self-sustainable. I'll let you know if I decide to toy with this idea though.