hi guys! one question:
i have the rocktron bluethunder pre-miltiefx for the bass side of my stick and the rocktron xpression multieffects for the melody side, the last one have chorus, delay, reverbero, picht scifter, flanger, compr, ecc.. but not the overdrives and distorsors.. a friend of my talk to me about rocktron piranha:

http://www.youtube.com/watch?v=VQdp4maajfY

someone know it? perhaps can change too much the natural sound of the stick??
i know i have all rocktron... but if you know something else different...
thank you very much!
Gabry