George,

Dave was talking about the VHG1 voice/guitar processor board option for Korg Pa80:

Hardware options include a vocal/guitar board that gives you two totally separate effect processors. In Guitar mode you have a complete set of multi-effects, e.g. modulation, noise reduction, distortion and compression, plus equalisation and you can use up to five effects simultaneously. The vocal processor includes a harmoniser that turns a single vocal into a four-part harmony, plus offers you effects and equalisation.

Paul Ip
from Texas