I've had Autocom units for some time now and in 2007 upgraded to the Super Pro Avi unit.
It has some really nice features:
Foolproof VOX performance guaranteed to 180mph — even for bike-to-bike.
Side tones-duplex intercom-instantaneous voice activation for normal speech patterns...
I know it's not an AT or TA but thought it may be of interest. Takes a while to download, but worth it.
http://www.motoboxer.plus.com/movies/ Right click on Porsche GT3 and Save AS