Author: Johan H Nilsson
Date: 2014-10-24 11:13
The F4 should be a little flat, otherwise the tone hole for the index finger is too big and will not have resistance enough to act as an altissimo register hole. If you play altissimo tones pp a too big hole will cause grunting, or at least audible undertones.
To locate the cause you need to alter different things to eliminate them as a cause. Try soft/loud tones, partail covering of the E hole, different register key openings, etc.
And make sure to post your findings here. It's good that solutions get posted, not only problems... :-)
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