Aren't mid-bump and transparent kinda opposite?
I'm not entirely an expert on the subject, but when I listen to people talk about the sansamp, I hear a pretty notable association between the unit's coloration and it's massive midscoop (something I can attest to in brief trials with the unit). However, my bass (with my hands) has a pretty notable midrange bump of its own, so I suppose a flat response would what I'd be seeking in the Flipster.
