Killer Wa Wa, Tremolo and Amplified Cup

The more airtight your cup, the more muted your sound. The more muted your sound, the darker your amplified tone is and the stronger the difference between your closed and open cup is for the Wa Wa and hand tremolo effects.

How do you test the air-tightness of your cup?... hold your harp in the normal fashion and then drop your harp in your lap. The shape of your hands should be the same as when you're holding the harp, just minus the harp. Now bring your hands up to your face and blow... wherever air leaks needs to be closed. You can do this with or without a bullet mic (just don't have the amp turned on ;-).