I purchased this D.I. to give a go with my guitar to some multi-efx units I had laying around in my studio, only sporting XLR connections. It should basically work as a standard D.I., but with the "level" knob control, I thought it could somehow also work as a mighty "preamp" to drive the multi-efx inputs a little harder. Long story short: this was not the case, as the "level" had no sensible effect on that, besides it still allowed me to do the trick and certainly did not alter the sound in any tangible way (I mean: no more than the old 12 bit DACs on those efx-units could!). All in all, a sturdy product delivering what it was built for.