[Alan Brinton]

That makes sense. I ended up with ten open holes, with a combination of open holes with which wah-wah effect can be produced working with just the third hole in from the low end (left end in your photo). The next open hole is the 11th in from that end. But the results don’t even begin to approach the dramatic effects you have been getting with your setups and techniques.

I look forward to hearing your new studies.