• Hoarseness is caused either by condensation or droplet formation in the wind tunnel, or by a too swollen block
• In the case of hoarseness by droplet formation, anticondens can be dripped into the wind tunnel and distributed over the block and channel superlattice
• Here it reduces the surface tension of the condensed water: it does not form any disturbing droplets, but flows off as a smooth film
• The "hoarseness" of your flute can be effectively prevented