Is it a hissing sound?
Do the octave pads open enough?
Check to see that only one octave pad is open at the same time. One octave pad should be 100% closed when the other one is open.
How is the key height?
Check to see if the C key really closes both the C pad and the C# pad (the small pad that is closed by closing any of the LH stack keys).
Did this happen recently or has this always been an issue?
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