Adimatis,

I don't know about Yamaha's registrations, but in Roland KBs User Programs save the entire setup of the instrument, which is not only the voice selections, but also the style, tempo, effects, transpose, etc. Older models (G1000) had several buttons on the front panel to lock out changes in either of those, so it was easy to use User Programs during a song to quickly change the voices without changing the accompaniment, then between songs to change everything, as needed. I am sure the same functionality exists in the G70, except it is hidden somewhere in the menus, so it is not as easy to access while playing live.

Another thing, I understand that the User Programs do not save the settings of the One Touch memories, so pressing one of those buttons can throw you off - at least this has been my experience playing the G70 in the store.

Regards,
Alex