hello johan,
Bogdan, I guess you mean 40-50 external voices on the SX700?...
.. well, as said, it depends on voice sizes. If voices are 30MB in average, then about (400/30=) 13 voices fill fit into expansion memory of SX700.
...Also note that the expansion styles are stored in the internal memory (1GB on the SX700) and do not use any expansion memory which is only used for the wave files.
I think that's not exactly true... If we install a pack, that contains styles and voices, and then check on keyboard, we can see that both will appear in User>
Expansion section. Btw. if you try to delete/rename a style in Expansion section, you'll see, that that's not possible. Styles will only be in User>
User section, if they're loaded from USB separately (for example, as *.sty files -not as a pack) or if they're created in keyboard.
Voices (wav samples) can't be loaded manually and so we can't have them inside user section. We can only install them by using packs, and so they land in Expansion section. However, we can load voice "settings" files into user memory by using *.vce files -obviously, that's not the same as wav sample.
There's another thing that need clarification... I haven't really tested that (and specifications are a bit unclear), but I think there's not 1GB User memory + 400MB External memory. The way I interpret specs, there's 1GB of User memory, where 400MB is reserved for Expansion packs. That explains why both, User AND Expansion, reside inside User selection.
Bogdan