A few weeks ago I wrote
about my new audio
interface. Since then I've used it to run sound at two dances, and
it's done what I wanted it to. I've also tried to use it for
recording, however, and am much less happy. I keep getting clicks in
the recording.  For example:
Zooming in on the audio it looks like this:
That's three tracks of audio and one track of nothing, showing a
single sample out of place.
I made some more samples:
Looking at these I thought I saw a pattern: for a few samples in a row
the sign is reversed. It's hard to be sure, though, with this setup.
So I tried a higher pitch sine wave and put the mics at different
distances so they'd have phase shifts relative to each other. Sure
enough, some glitch is flipping the polarity:
(On track 1 two samples are flipped while on tracks 2 and 3 three are.
On all the others I looked at the same number of samples were off on
What would do this? I don't know. I've posted
on the presonus forum; we'll see what they say.
 While I noticed them whatever I was doing, I decided to make a
test setup so I could really see what was happening. I had my phone
generate a sine wave and pointed three microphones at it. I restarted
my computer (a mid 2011
13" macbook air on 10.8) so it would be fresh, started VSL (1.2.5296),
started Audacity , and set it to record all 8 tracks.
 I also got these clicks when using Presonus' Studio One, but I'm more
familiar with Audacity so it was easier to take screenshots and make
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