Just started frailing/clawhammering/whatever, still playing my student bluegrass banjo and thinking about upgrading to something with less twang and more thump. Anyhoo, the instrument I have since fell in love with comes with this feature and I was wondering if one of you old time vets could please explain. Yes, I did a forum search and found nothing. BTW new here, very nice site composed of very nice posters. Thanks in advance.