DNJ,
With Ketron (AUDYA, but most apply back to previous Ketron Products), you can also store within a Registration (appart from the obvious style, transpose, voices ... etc)...
* Another Registration.
* Style(s).
* Voice(s).
* Wave
* Mp3
* User Voice List
Let me further expain why I included style and voice above.
When you recall a Registration, ofcourse the keyboard sets up exactly as it was for that song. However, F1-F10 (X 2 pages) can now be used to instantly access styles, voices ... etc (depending on what you stored in there BEFORE saving to a Registration.
So at a show, you can instantly recall a Song setting/Register, and as you are playing, press F4 (which could be a Midifile and it's new transposed value which starts playing either instantly or at the start of the next measure - depending on how you programmed it), or F1 (FLUTE) to instantly access the flute, or F2 Dance.wav (which could be a wave file) or ... choises come close to being endless.
The BLOCK REGISTRATION takes it up a level where you can now store many (20) Single Registrations / Song settings which you can recall ... on the fly!