Greetings - I am asuming that it must be a Sony (they are the only MD suporters I know). I think what you need is a Sony RM-X69RF (FM Modulator Package). This will control the MD changer. It can also convert the RCA signal to an FM (which you wont need in the application). I would check with crutchfeild to see if you can still use the RCA to the Empeg while you use this to control the MD...

Good luck


-Doug
(Mk2-12G-Blue or Green)