Hi EricOkay, I understand the logic in learning to work an out of the box harp. I'm gonna continue to work on my SP20 as I have already done some basic gapping work and it's seen quite alot of wear so i can afford to mess around with it.
Please check : www.planetharmonica.com
there you'll find an article about playing chromatically on a richter harp. A few customized harps are reviewed and amongst them is one of my harps...
I'll be glad to answer all your questions on how to set-up a harp...
Ben Bouman Holland www.marbletones.com www.marble-amps.com www.harmonicainstituut.com