Terry,
I think maybe Charles has hit it on the head here when he says the control of the Miditzer from the AR 80 takes place through the midi-cable; but the sound does not go back to the AR via the USB-midi cable.
Charles ..
Do you have a cable from the Laptop's OUT (eg. the headphone socket) to the AR's LINE-IN (ie. the PHONO sockets under the AR) .. or into the Mic socket?
Terry ..
So how are you getting the sound back to the AR? Maybe you need to look at the Settings for the sound OUT from your Laptop. This would be done via the Sound Manager program on your Laptop. With my Laptop, just using Audacity was a nightmare as I have to configure Sound Manager to correctly allocate Inputs and Outputs. I have found in the end that it makes a difference which order I switch things on and plug them in. Recording to Audacity I have to first switch on my Mixer, plug the USB lead from that into my Laptop, and then turn my Laptop on. The Laptop is then searching for inputs and picks that up. If I don't already have the Mixer ON it picks up the INPUT internally from the Microphone on a headset, even though I don't even have a microphone on my headset. I just use headphones, but don't even have those plugged in. I think headset must be the 'default' if it can't find anything else, whether I am actually using headphones or not.
Hugh