I just got a “Shure A85F Transformer; Low Z, Female XLR to High Z 1/4-Inch Phone Plug” which you can get on Amazon or most guitar/music shops locally for about $20. WOW what a difference! No need for a preamp overdrive or booster at all with this thing, and that’s a good thing because I was having feedback problems from time to time when using a preamp booster. This solves that! I think EHX should really add an internal transformer that can be switched on or off, or at least advise people buying the 45000 that if they want to use a mic then they need to buy the transformer. Only took 2 years to figure this out… haha but anyways love the 45000! Thanks EHX for making such a great looper and recorder! Looking forward to the next one you put out that maybe has 4 dedicated inputs and 8 or 16 channels so I can ditch DAWs all together, cuz I hate computers while recording.