Can't remember if the GR20 has a tuning function, but am certain the default is 440. Might try a system reset, which is what I do with any used gear that I buy. There is a neat manual on using the GR20 with a DAW, which isn't exactly what BiaB is, but is still helpful in understanding how to get the GR20 to work.

http://cms.rolandus.com/assets/media/pdf/GR20WS03.pdf

Hope this helps.

The GR20 is a neat interface, I have one, but not in heavy rotation. Have been playing MIDI guitar for 25 years or so (starting with the Casio strat that Mario has) and they are a lot of fun.


DC Ron
BiaB Audiophile
Presonus Studio One
StudioCat DAW dual screen
Presonus Faderport 16
Too many guitars (is that a thing?)