Hi,
sorry, but I can't help. You've probably got the equipment incorrectly set up ie line in's and line outs etc.

You might be better off changing your topic ie
Help: Is anybody using Sound Forge with an External Sound Card ( M Audiophile) and an Arranger Keyboard ( genesys).

I would imagine the principles may well be the same for whatever brand of external sound card or arranger keyboard you're using. Also may be worth mentioning whether the card and the keyboard have USB.

Sorry couldn't be of more help.

bet wishes
Rikki