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Can't Set Exposure

HP 3D Scan
Microsoft Windows 7 (64-bit)

I'm trying to run calibration and set up my cameras & projector. I'm getting a lot of flickering/ visual waves in the live camera view. Everything I've read says to set the exposure to 1/60 s, however, the software seems to have locked out the option to manually enter a number. The slider runs from 1/16, 1/32, 1/64, 1/128, etc. 1/64 is the closest, but it still flickers. Projector is the standard Acer K132 at 60Hz, dual cameras are DAVID-Cam-4-M. Changing the frame rate limit doesn't make any difference. I'm running HP 3D Scan Pro 5.6.0, setup type is HP 3D Structured Light Scanner Pro S3. Any ideas?

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