Update ... I took the JTV89f into Sweetwater for repair. The tech found the wiring reversed on the 6th and 5th string bridge saddles. After the fix, the warbling on the 6th string using detuned acoustics is gone. The boominess of the sixth string using the martin acoustic is gone. Overall I think the acoustics sound better than when I bought the instrument ...
Repaired under warranty.
I've been using line6 pods and variaxes for many years. I enjoy the flexibility they provide. However the last two items I've purchased through Sweetwater (PODHD500 and JTV89F) have had hardware issues. Definitely try before you buy.
