[thaumasiotes]

> Hold your hand in front of your mouth and feel the difference in pressure when you pronounce the first sound of the word "tune" versus the word "dune". This will let you feel that puff of "aspiration."

The aspiration will be even more obvious if you try speaking into a microphone.

[euroderf]

It's not a problem to speak into a mic if you can program yourself to pronounce all 'p's as 'b's. Works great.