Assuming you want to use the DGX to trigger play the PSR, you require one Midilead Midi-OUT DGX to Midi-In PSR. You can of course bring the volume up on the DGX to mix in its sounds with the PSR if you wish.
Give it a try you can't do any harm to either board. Some combinations can work and sound very well.

Graham

[This message has been edited by Graham UK (edited 09-27-2003).]