pad bank d-h no sound

hi guys
i have a problem with my pad banks.
when i load the 808 expansion (or other expansions), pad banks a-c work perfectly, but when i try to use bank d-h i dont get any sound out of them.
please help, would really appreciate it!

i use an mpc studio with the current firmware.

There's no sound as the patches you are loading only have sounds assigned to banks A-C. It's not a requirement to use all banks.

If you load up some patches from 'The Bank' expansion you'll see those often use all banks.