Topic: Bassoon chirp--maintenance?
I have a student who has a Fox 240. Just recently, she has been dealing with an annoying chirp when playing high Bb slurred down to F above the bass clef staff. I thought there was a leak, and found a sluggish F key pad cup-- freed that. Chirp still there. I added a bit of dental floss around a loose wing tenon. Chirp still there. We tried different reeds, her other bocal, and my bocals. Chirp still there. When I play it, the chirp can be lessened but not destroyed by loosening my lips quite a bit, but pitch is not good, then. We have tried more air, less air, tighter embouchure, looser lips, etc. No change.
Unfortunately, the closest repair tech that I trust is about 3 hours away, and this is a college student who needs the instrument now. Where should I look to help the poor beast of a bassoon? Just deal with it until the end of the school year?