Dear Chico,
Thanks for the link. I tried getting the information from PSR-tutorial, but they don't mention there changing preset to user voice after recording a song.
A few months ago I recorded a song and used a preset voice (for example on channel 3). Now I want to change the voice only on channel 3 into a user voice that I saved a few days ago.
When I tried changing Program Change from voice "0" into my user voice, it didn't let me do so.

Lahav