Trying to figure out why my Micro Cube is "woofy"--like low frequency feed back on the low e and a strings--when around 7th fret or higher. Was thinking maybe the pick-up height on my guitars was too high--but it does it on 3 different guitars--and one is a single coil strat and the p/u's are nowhere being too near to the strings. I use 10-46 gauge strings. Going out this weekend and try out some different amps to see if maybe it's the amp. Usually have it at half gain, around half volume, and the tone control towards more treble than bass. Makes no sense to me, unless it's just something micro cubes do. Anyone had similar problems or an idea as to what might be causing this?