I've heard great things about the Electro-Harmonix POG (just octaves, up and down 2) and HOG (octaves, fifths, thirds, MIDI, expression pedals...). Not an intelligent shifter, though. But apparently tracks extremely well and sounds great, and the sliders are nice for mixing the various additions together. Daryl Shawn www.swanwelder.com www.chinapaintingmusic.com