What happens when you use an Audio Interface with an AMP

[Nutul]

I've edited my comment a little to clarify that I'm talking about TRS connectors here; shorting cold to ground on an XLR output is probably a bad idea if you don't know what the driving circuit looks like. However, it is a fact that audio pros will connect anything to anything that fits, so any studio equipment with 6.3mm jacks that don't handle TS connectors will probably be very short lived, and will garner a ton of negative reviews. So I don't feel lucky, I feel rather comfortable.

Not complaining. If this is the reality about audio pros, then be it...
There is always a way, and the proper way of doing it. Nevertheless, if the outputs are protected against shortening it's always a good thing. Only I wouldn't abuse it.