Hi Peter,
For a vocal Prozessor a bit prizier than the Manley VOXBOX, have a look at the various TC-Helicon products. I for myself use a VoiceLive 3 when I Play guitar along with BandInABox an it's great fun to play an sing.
The harmonies can either be driven by the guitar, a built in rome-sense mic or an seperate audio Inpu.t

Last edited by Thomi; 12/01/16 02:08 AM.