When starting a previously working VARA FM program attached to a Digirig interface I've often encountered no receive audio showing on the VU meter.
Before you go into Windows and start tweaking the audio settings...
Try clicking on the VARA settings tab and then the SoundCard button. While there insure the input and output are USB Audio device, they probably are.
Like magic, when you close the dialog box your audio is working!? You're welcome.?
I have no idea why, but, I've seen it work too many times to ignore.
73
Mike N0QBH
N0QBH Mike Berg