Interesting how each manufacture goes about button assignments.

On Wersi OAS 5 -7 instruments (OAS 5 came out in 2003) all the factory and user sounds and accompaniments are separate, however all the mappings of the sound and accompaniment buttons can be changed, (Each button can have up to 5 levels and 9 sound/accompaniments) you can also create your own mappings which can be stored in the pre-sets if required (Factory mappings are always there so that you can copy them back if needed) thus you are not tied to 1 single mapping system. (You can assign what mapping you want for each pre-set without restriction)

The best part though is that each pre-set (In addition to the mapping) can also store up to 9 accompaniments and up to 9 sounds per layer per manual (U 1, 2, 3, L1, 2, P1 on the smaller instruments or U 1,2,3,4, L 1, 2, 3, P 1, 2 with the larger instruments, in addition the smaller instruments can also have the same number if you purchase the Selector Plus option) which can be taken direct from the OAS Database. (IE they do not have to be already mapped)

Another beauty of the Wersi system is that the accompaniments can be a Wav, mp3, Style, Real Drum Style or Video, while the sound assignments can be Wersi, STS, Akai, External Midi or VST, as they all treated as if they are the same.

As far as I am aware there is no other manufacture apart from Bohm that comes anywhere close to this flexibility.

Bill