REW Beta Release Possible problem in REW 5.40 Beta 117 - Generator misbehaves after update?

[mlloyd1]

My audio interface is a MOTU M4 and I'm running Windows 11.

Earlier today, I updated the M4 driver, M4 firmware and REW (from 5.40 Beta 116 to 117)

Now, basic loopback looks weird when I engage the generator.


I initially thought is was the new M4 firmware, so fired up ARTA to see if it behaved the same - I think it should if the new M4 firmware or software is at fault.

It did not - see image 2-ARTA, so I suspect REW. BTW, the ARTA image is close to what I normally see when REW is running correctly.

I ran the REW o'scope to see if I noticed anything about the generator output and saw the distortion shown - see image 5-scope_generator_on REW.

I included a couple of shots of MOTU M4 output: 3-loopback_generator-off REW shows output when generator is off; 4-loopback_generator_on-12dBFS REW shows output when generator is activated to put out -12dBFS sine at 997Hz.

I'll try going back to previous Beta but wanted to flag this in case it's a real issue (instead of the most likely scenario of me having done something boneheaded )

Never saw this behavior with other REW versions, but that doesn't mean I didn't mess something up.

Pictures included:
1-REW version
2-ARTA loopback
3-loopback_generator-off REW
4-loopback_generator_on-12dBFS REW
5-scope_generator_on REW

Any ideas on what I might have done to screw things up?
mlloyd1

 

[mlloyd1]

I removed 117, rebooted, reinstalled 116, rebooted.
Ran a quick loopback and things looked as good, expected.
Then, I removed 116, rebooted, reinstalled 117 (same download as previous; did NOT download a new file) and rebooted.
Then, reran a quick loopback.
You already know what I'm going to say, don't you?

That's right - this time it worked fine; image attached.
Well, it IS Beta....
Repeated the test 5 more times (so far) and came up good each time.
So I'll just pretend this never happened.
Back to your regular programming ...

 

[John Mulcahy]

Nothing to do with the REW version, samples were being missed. Check the buffer size if you are using ASIO, the firmware update may have reset it to a lower value.