Question / Help No sound with obs studio & mag254

Will someone please put me out of my misery.

I'm using OBS studio 18.0.1 and I'm trying to stream off a mag254 stb using an Avermedia GC550 LQX capture card. No matter what I try I just cannot get the audio to work.

I've de-installed & re-installed the drivers for the GC550 LGX (several times), gone through every audio setting on both OBS & the mag254 but all to no avail.

If I plug my VU Solo2 back into OBS then the audio comes straight back on.

I'm losing the will to live so much that I've just stuck my head in the oven only to remember it's electric.... The next course of action will be to through this dam PC out the window (ok a slight exaggeration there, but you get the drift of how frustrated I am)

Please help!!!