If I remember correctly there's a couple of different pitch shifter models as well as an Octaver on the MS-60B. One of the pitch shifters is less wobbly than the other and, as you say, tracks better and lower than the Octaver. I was initially using it to drop a tone which still has a touch of that chorus like edge, but set to the full octave below it really it's far less noticeable. As I said, you don't notice any detriment to the bass tone with the rest of the band blasting out.