Well, how about the Happy Nerding Isolator? 4 hp, plus it DOES have transformer isolation and a ganged stereo level control. As for the Befaco, I even looked over the PCB diagrams and saw nothing resembling a transformer on them. If you go with the Isolator, you won't have a headphone jack there...but at the same time, the WMD mixer does, plus that same headphone output is where you'd be able to check things (like tuning!) on a CUE bus via the CUE/MIX crossfader. Using a headphone pre on a different module, like an output, won't give you that functionality.