Alan:
Yes RXTX. It is definitely software. Everything works, it sets the RXTX to transmit, but no audio comes out of the sound card to the RXTX. The display shows the audio from the mic. The exact same hardware works fine on 1 of my PCs but not the others. It is snot the sound card, I tried several, and they all work when sending the sound to the speaker but not when programmed to send it to the RXTX.
Howard
