Super cool! And the real-time transposing without affecting sample duration is something Amiga Paula chip users can be jealous of 
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Not per se... There was a tracker on the Amiga that also did just that. Quite CPU intensive, can't remember the name though. And that tracker never broke the Sound/Pro/Noise/...-Tracker "standard".
But, more ontopic: Really, really impressive
Anyway, updated Realfun online.
phew, Peter, that's just.... wow!
This player with this kind of songs have to become the bgm of a msxdev game 
Come to think about it, it's been a long time since you guys entered the compo 
Thanks for all the kind words! But honestly most of the credit goes to ARTRAG and his voice encoder, that is the source of the magic.
Implementing the sample playback in the z80 re-player is next on the list. However, there are several ways how to do so. Each with its own pros and cons, which makes a bit complicated... I need to think on it a bit more. On the plus side, I did already reserve a bit for sample playback in the song encoding stream, so no big reworks expected there
I am tempted joining this years compo, got an idea and all, but we'll have to see how wel everything goes
Very impressive! Indeed, it'd be very cool to see it in a game/demo. I haven't followed the whole thread, so, I'm not sure if it uses a lot of CPU or not, but if it does, at least it could be used in title screen music, for example