Question

(art quadra fx multi effects processor) is the effects unit i'm talking about I also would like to add a compressor and mic pre amp if possible. What would be the safest way of doing this?

Answer 1

It's not recommended to use external FX with the AudioBox USB due to the preamps that are already in place in the AudioBox inputs.

The inputs on the AudioBox are not intended for line level signal (which is what most external FX units and compressors will have).

You may want to invest in a DI box that takes line level signal down to instrument level.