I'm trying to output (ideally a subgroup or an aux) to a laptop for use in a livestream. But whatever I do, I end up with static and hissing.

An example here:

https://www.youtube.com/watch?v=zW5Ay9yyY1k

I'm using this cable to run from subgroup 3/4 to the line in on my laptop:

https://www.amazon.com/LinkinPerk-Split ... B07PR3SGHM

The only thing I've found that works is using my ancient Zoom H4 and connect it as a USB audio source using an XLR cable from the mains output. But that's a pain to setup every week and I wouldn't think it would be necessary.

I'm assuming it's electrical noise, but I don't have any ideas how to eliminate it. It does it even with the laptop on battery power.

Any ideas would be appreciated.

- Steve