I've been thinking about getting a tube pre-amp/direct box for live and recording. My main goal is to warm up the sound. I don't need tone controls other than whats already on my amp, so I was thinking why not just use a nice DI. It would help keep my rig portable too. Anyone doing this currently, does it work for you? Anything that I am overlooking? My amp is a GK 800RB and my basses are all active.