Hi Bob, I tried running the version 3.17 program for the DSPX and got it to work. However there were several problems that I noticed. There was a strange ringing noise heard in the USB mode with no filter selected. No USB or FM transmit, but heard the LF carrier in the speaker. I reversed the DAC output leads and this made the transmitter work. Hope this helps 73, Bob Johansen WB2SRF