Matt Molloy fast switch between b-d-a-d

[ecadre]

The "Youtube" clip is exactly the same length as the track is on the CD.

I've never heard the CD, hence my qualification.

[jemtheflute]

The album pace isn't outlandishly fast whatever may have gone on with the technology. I'd submit that one would struggle to play that figure cleanly without venting the D as unvented it would tend not to speak cleanly at that speed or even quite a lot slower. It's pretty straightforward anyway, and as others have said, just a question of practice, making sure your fingering changes are quick, well coordinated and clean. For that you need to be confident of the pattern (slow practice) and relaxed, with no unhelpful tension, so good flute support matters.