[quote name='ZMech' post='1259805' date='Jun 7 2011, 03:28 PM']Despite that it's an envelope not a wah (although I think you can add a pedal if you want), check out the Source Audio bass envelope filter. From the demo vid's it looks seriously awesome! GASing after their distortion pedal atm.[/quote]
for the money, this is the most versatile envelope filter pedal around. the only issue is that so far it can only be manually swept by the 'hot hand' controller (a wah on a finger-ring-type-thing), although there is the possibility of a foot controller adaptor (or similar) arriving soon.
the pro version (due for release in a couple of months) promises ace fun, and i would bet that that will be footswitchable.