Trouble calibrating UAD Apollo Twin Thunderbolt as a sound card

[greiswig]

Hi, all,

I'm sure I am doing something incorrectly, but something is not working right. Here was my process that lead to the capture below:
1. Turn down the monitor out on the UAD all the way
2. Turn down the preamp all the way, have it set to Line (not Mic)
3. Put an unbalanced patch cable between the R Mon Out of the UAD to Input 1 of the UAD (I also tried a balanced cable, but that didn't make a difference)
4. Without turning up the Monitor out volume, I can only get the "In" and "Ref In" graphs up to about -67dB, nowhere near the -12dB required. Turning up the monitor output a little helps, but I don't think that's what I'm supposed to be doing and may lead to the oscillation I see below.
5. Run the program, and this is the result. Any help or suggestions are very much appreciated!!

 

[John Mulcahy]

You need to turn off monitoring of the input as it is feeding it back to the output, causing that oscillation. You should be able to do that by muting the input channel in the UAD Console. That just stops it being fed back to the output, it will still be captured.

 

[greiswig]

Thank you, John!! That was it.