Thanks for the response. I suspected such about the learning curve for the pricier units. I do a lot of vocals with BIAB live----and a little harmony is needed here and there to spice things up. I’ve not been pleased with the Harmony Singer 2 pedal, because of having to be tied to the guitar chords for the changes, which often result in glitchy vocals and are not always spot-on. I heard, or read somewhere, that TC Helicon may be introducing more pedals in the near future. Think I’ll wait and see. I got their Duplicator pedal recently. It’s a nice unit for live work, but no harmony.