I have a relatively new G5420T and it has a particular "thing" it does with volume. Please tolerate dumb questions because maybe this is the way all Gretsch's work but - The volume knob - both overall and by pickup - seems to graduate normally, UNTIL, I get to the last little bit before max volume and then it clearly jumps up significantly. The tonal quality gets better and the volume is louder. That appears to be the case with both volumes. Is that normal? Thanks and man I love my guitar, by the way.