We will have to separate the different issues.
To make sure your cable is OK:
connect it to both Tx and computer.
Do NOT start FMS or SPP
Select the right input using programme sndvol32.exe -r
Start Winscope as indicated in the Step-by-step section of my site (www.SmartPropoPlus.com)
If you see nothing or random noise then your hardware (Cable, Tx, sound card) is not good.
If you see a noisy signal then you might need to lower the input volume or add a resistor.
If the signal is good then continue.
Start FMS:
This will also start SPP
Does the the signal disappear from Winscope?
If so, SPP has changed the audio source selection. Click on the SPP icon in the system tray to select the right source. Make sure that the signal is on the Winscope now.
Select the correct modulation type
I'm not sure what it would be for your model. I think it has some proprietary PCM that is not supported by SPP. You will have to move to PPM for simulation. Do that on both SPPconsole and Tx.
Calibrate FMS
Hope this helps