So I know jack shit about using a hardware compressor. I just bought one and am trying it out with Cubase 8.5. I am using the RME babyface at the moment. I noticed if I turn up the "hardware outputs" on RME Total Mix FX (the audio from my babyface) to the compressor, at a certain point I will get an obnoxious ringing/buzzing. This is true even if I am not playing any audio. I guess this is confusing me. Why would it make that noise from just turning up the output, even when there is nothing playing and no audio being sent to it? Really appreciate any info. I bought the compressor used so I am now in this place of ignorance and of worry that there might be an issue with the hardware itself. Please enlighten me. Thank you!