When I had a Boss HM-2 in a send/return I was sending 70 and returning 60 IIRC. Imagine it goes up to 200... Well, better too much than too little! Also nice there is an input and output metering so you don't have to rely on your ears only!
For people using external pedals, particularly preamps and drives, what settings do you use for the send/return? Do you use the default 100 level or do you lower it? I tend to find the level is waaaay to hot.