Well actually, in your post that is a BB800 (which I own) and that has an xlr line out (and in) on the back ironically.
I was thinking the Interbass Preamp pedal which has a TRS (when there seemed to be probably enough room for an xlr) and also the newer BB802 on which they moved the xlr line out from the back panel to a TRS on the front. Both of these TRS outs are doing double duty as a line out/headphone out.
**EDIT** even more astounding is that balanced out is the ONLY out to be used as either a balanced out or out to your rig. The other out is to drive a cab. So the routing options are extremely limited considering what it is supposed to be - preamp/routing tool.
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