Hello, my friend! Sorry to interrupt you. I think, in this case, you might need a mixer that can adjust the volume for individual input channels.
I’d like to recommend our 32-bit/192kHz audio interface, the UP1. We’ve designed a highly functional TotalMixer specifically for situations like this. If you’re interested, I hope it can help you.
Our audio interface even works with mobile devices, maintaining its 32-bit/192kHz quality.