Hi Guy's
As you may know, or not, I tried the Fishman Triple play with my SD40 and gave up as I found it two tricky.
However I tripped up this piece of kit on Gumtree and being a glutton for punishment I bought it for £50.00 thinking I could bin it if it didn't work. To cut a long story short it worked even better, in my opinion, than the Fishman.
Regards, Col
It was brought out I think in about 2008 to allow guitar tracking on the old TC harmoniser's before they incorporated the guitar tracking into the later models.
Another interesting post at TC Helicon forum.
https://community.musictribe.com/t5/Musician/HarmonyControl-Guitar/td-p/253437