Hello, My question is a little off topic so feel free to respond privately. I was wondering why when I use the cat or echo command with my doubletalk speech synthesizer I don't get audio output? I am pretty sure my synthesizer my USB to serial adaptor and it's driver are all working because I have gotten audio output from speech synthesizer. Do I need to set up anything with my computer like setting the speed to 9600 baud in order to have the cat or echo command work? Any help would be appreciated. Sent from my iPhone