Brendan Power harmonica inventor info
The OVERBLOW BOOSTER – Overblows & Overdraws Made Easy! Plus New OB Effects https://www.youtube.com/watch?v=XSMVe1wG34I
THE OVERBLOW BOOSTER: http://www.brendan-power.com/OverblowBooster.php
The OVERBLOW BOOSTER – Overblows & Overdraws Made Easy! Plus New OB Effects https://www.youtube.com/watch?v=XSMVe1wG34I
THE OVERBLOW BOOSTER: http://www.brendan-power.com/OverblowBooster.php