Anyone ever play around with a Bokken with a groove? I just picked up one of these
. Its pretty cool, it gives some audio feedback. I just picked it up for some suburi and solo kata practice.
by your question it seams to me that you are new in Budo
groove on bokken have only one purpose, to help you with "hasuji", audio feedback, or sound is signal to you that your Hasuji is good or bad, on my bokkens Hi or bohi (groove) look like on real sword, because cross section on bokken is different than on shinken, my bokken make sound when Hasuji is not good, her is pic.
here you could find more info about Hasuji