Thanks for the reply D. Are you telling me that if I connect to the Matrix Audio device via Hyperterminal and send Z11, this will control the device? Seems from other posters and internet searches, there are more commands required in a serial string.

Also, the link I sent for the device manual specified a null modem cable. I havn't seen anywhere in the vantage documentation specifying which cable type.

Thanks D. Sorry to be such a rookie.