Not sure where you hear that it was compatible, but at this time our product only works with the Sirius Connect, Sirius Streamer, XM Direct, and XMPCR.
Yes, you are correct then, this unit WILL work with TimeTrax.
The dark grey part of the SC-FM1 Starbase is the actual Radio Tuner. In order to use it with our product you would need to remove the three small screws that keep the silver portion attached to the grey portion.
Once you remove these screws the two pices will separate and you will see that they are connected via a plug.
The TimeTrax device just plugs in where the silver unit plugged into the grey unit.
I just confirmed the plug is there...
One more question; will I still be able to use the head unit/remote that came with the radio? Or is everything controlled via the PC it's connected to?