After a bit of an investigation today I found the 532 laser's SMPS to be ring oscillating at a similar frequency, accentuating the noise but it's still not the same noise as what the scanners are making.
Steve - no he doesn't unfortunately
If I turn down the green, by way of the driver pot I migrated to the back of the projector, the sound disappears so it's deffo when the green is being driven.
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My Brain urt's!
Continuously in Awe! of (H)Al, the Photonlexicon Font of Complete Knowledge - The (H)Al'PL Database of complete puss that no one needs to know or ever trusts as he ain't really got a Scooby doo about now't!