Thanks irad.
The computer has both an in built speaker and also a audio socket, but the Signalink USB Codec is connected via a USB port, which is connected to the Signalink USB codec, (the VARA modem has this choice). So yes, i can split them if i can find the HMI.
I think that with other digital mode software i have used, you are able to select to have the alert tones (which are just to alert humans to the arrival of a new contact) to be directed to a different audio device, other than the USB device so that it is not transmitted. But i can't seem to find a HMI to create this opton. I am using VOX to key the FT 747 GX transmitter. I wonder if there is a HMI I missed somehow and if not, can this be fixed in the next release?