Lexicon MPX G2 - Manual (Page 171)

10-2
Lexicon MPX G2 User Guide
The MPX G2 doesn't respond to SysEx commands.
Check the SysEx setting (and the Receive Device ID selection) in the System
mode MIDI menu.
The MPX G2 does not transmit SysEx Automation commands.
Check the Automation setting (and the Xmit Device ID selection) in the System
mode MIDI menu.
The MPX G2 performs a series of self tests each time it is powered on, then
displays the MPX G2 copyright notice. This should be followed by the display
and loading of the last loaded effect. If this sequence does not occur, contact
Lexicon Customer Service. Power On Behavior