You have the line-in enabled in playback. That's a no-no. It's called monitor mode and causes feedback.I can find no option (save SPDIF) for loopback recording.
Thanks for the help, and the patience, brucek.You have the line-in enabled in playback. That's a no-no. It's called monitor mode and causes feedback.
Mute the line-in and all other Playback Mixer options except Master and Wave.
The line-in is only enabled in the Record Mixer - not the Playback Mixer (which you show in your jpg).
To select the Record Mixer - select Options - Properties - Recording
OK, that looks good.
Let's now discuss why both left and right line-in channel VU meters show a signal, when you should only have a single loopback cable on the right hand channel?
You require 2 stereo splitter adapters so as to 'break-out' the left and right channels. I've seen the incorrect use of both channels in the soundcard cal cause feedback (as you have).My sound card has only 3.5mm inputs and outputs