Just out of curiosity. What is your work flow for creating your demo's. Do you use your recording capabilities of your keyboard? Another recording/mixing device?
Tx
Not to interfere with Dave's reply, but, instead to add to it, I use a similar method to his, only that I use the internal midi recorder in the Tyros4 and then bounce it over to the T4's Audio Recorder which gives me a Wav file.
Sometimes I'll edit the midi tracks for volume/effects etc., and also, like Dave, if I'm not happy with the first take, I simply re-record the whole piece, which is usually quicker than editing.
I then import it to my PC where I can make an MP3.
You can use the same process on the S910 if you so wish.
Again, apologies for butting in.
Ian