;previous track
SC110::F7
;next
SC119::F8
;stop
SC124::b
;play/pause
SC122::p
;mute
SC120::Enter
;vol up
;routed to arrow up
SC130::Up
;vol down
;routed to arrow up
SC12E::Down
mPod said:"Multimedia Keys" as you call them should be handled by MP's General HID mapper.
Here's a list with all defaults:
http://wiki.team-mediaportal.com/KeyboardShortcuts
MP's keyboard mapper will be replaced soon with a more flexible one.
Currently you can change your mappings in configuration.exe/Keys and Sounds