I've just (finally!) got around to setting up my new supergun - a Sigma AV5000. Basically, I'm using it with an RGB Scart cable, on a RGB CRT. The good news is that the picture looks great...the bad, is that I can't seem to get any sound

I tried playing around with the volume on both the tv and the PCBs, but to no avail...but then I noticed something strange: this is on a Sony tv, and when I cycle through the AV channels I can pick up sound on AV3 :S However, there's no picture. On AV1, I get RGB picture, but no sound.
For the sound connections, I'm connecting just with this Y-cable (I'm sure that's not what it's actually called

), that came with the supergun. I can post pics if needed...there's one connection on the Supergun itself (which this cable goes into), and then this splits into the two connectors that go into the tv's front audio jacks. I really just need a way to somehow combine what I'm getting from AV1 & 3

Which I'm sure's probably easier said than done! Any help
much appreciated
