Emu XL-7 & MP-7 User's Group

Just did a quick test: 

1. Opened remote control
2. Pressed buttons
3. Monitored sysex sent from P2500

Results: 

Neither the transport nor the 16 trigger/mute buttons transmitted 
remote control sysex.

F0 18 0F dd 55 40 10 F7 = open remote control
F0 18 0F dd 55 40 11 F7 = close remote control

where dd = sysex ID [MIDI menu system]

Hope this helps.

Footnote: On my P2500, if the master volume is < 100%, master volume 
data is sent nearly constantly when remote control is open.

--Steve