Hello, I have a problem. First of all, I want to start by saying that I am not a sound engineer, I am a voice over talent who recently is planning to go into the VO bussiness very soon. But I have a problem with my recording setup, namely that I get some sort of electronic buzz/hiss on my recordings. I am sitting inside a whisperroom that is treated with acoustic froam, I record through a Neumann U87 and I'm using an Avalon 737 preamp. Now, my interface, wich I believe is what causes the problem, is a Yamaha MG10XU mixer that has a usb connection and also works as an interface. However, I think its the yamaha that is causing the buzz, but I'd like to know what you think? Should I ditch it and get a proper interface that can be used for the sole pupose of being in a chain like this? Are there any good, quiet interfaces you can recommend that doesnt cost way too much? Or is it just that I'm doing something wrong in my ignorance and that whatever is causing the buzz is easy to fix by pressing/turning some button? I'm kinda desperate, I want to be able to record as soon as possible.