This.Hi
I think I would go with the factory recommended spec - ie 500ma.
It comes with a wall wart and it needs an isolated supply - if you buy a multi supply brick be sure to get a good one with isolated channels. Most of these will have a couple of 500ma output jacks.
Mixing digital pedals with analog ones is always a crapshoot, and you often don't find out you've got a potential problem until you're in a room with iffy AC power.
There are a ton of posts on this thread (and others), with people unsuccessfully trying to troubleshoot come-and-go digital zipper noise, etc.
Save yourself the headache- either use the recommended Zoom wall wart, or at least get a good, brand-name power supply with a.) isolated outputs, and b.) at least Zoom's rated minimum current requirement.
