Re: blue masking tape best for covering up dud reed?
What i have used is the type of tear-able and writable matte cello-tape (scotch tape?) under a flapper at the obstructive hole. You'll cut out both the in- and out reed at that position then. Use a thin type of tape for this quick fix: far less work and more controllable from the outside. It usually leaves no residue. - Nout
Re: blue masking tape best for covering up dud reed?
I like that...ghost turd. In other words, check the reed completely to make sure there isn't any dirt/dust/hair on it. You'd be amazed what a little buildup or a bit of lassies hair will do to the sound of a reed. A really clean dust/lint free cloth will work.