I have been playing since 3 yrs.. i have greg bennet av3 and marshal 10W practice amp and this is my first effect unit.. I am looking for pink flyod, led zepp, metallica tones.. i mostly practice on my own so i want looper,drum machine, usb for recording and expression pedal.. these features are must.. i want views for both on pedals on following points 1. EASE of USE: a. patch switching... say switching patch 1 and 25 or A1 to B5 b. patch creation.. boss has large library of patches available where as zoom does not provide any so easy it is to create tone from scratch.. 2. tones and amp modelling 3. number of simultaneous effects.. zoom claims 6 simultaneous effects in g3x but boss mentions nothing.. any boss me 25 user..pl comment on this.. 4. interface with computer a. is the recording quality any good? b. can the drum machine and looper be simultenously recorded? c. can usb interface be used to play backing tracks?