A couple of friends have asked me about effects- one is an acoustic guitarist* looking for simple, easy multi-fx(I'm thinking the Zoom gtr equivilant to a B2 or B2.1u); the other is a harmonica-blower(but a VERY pleasant one- he does NOT overplay/wank all over everyone else

)looking for a basic, pretty much always-on delay(he had previously borrowed a Dan-Echo but it's noisy).
*I realize
most many acoustic guitarists are not that into FX, and she may go electric soon, but for now we're just trying to get her feet wet. I know she specifically wants wah, but beyond that I think she needs to hear/play a few to see what she likes.
So my questions are *what's a good basic slapback delay for harp?* & *Is the Zoom gtr multi roughly equal to the bass version?*