Hi NopMicro,
When you say FM demod you are referring to demodulating and playing the resulting audio waveform? The Spike software has an audio player in the utilities file menu. We are also compatible with an SDR application called HDSDR which has much more extensive audio playing capabilities. You can find the files and setup guide for HDSDR compatibility at this link.
https://relatedcontentdemo.kinsta.cloud/sigdownloads/Other/HDSDR-SignalHound.zip
Regards,
A.J.