Fluttering sound Motu M4

Hi all

I have been happily using my current setup live for several months with no issues,

Mac M1 16GB RAM
Ventura 13.6.1
Gig Performer 5

I have created 60 rackspaces, all work as expected and sound superb.

Whilst looking at incorporating Vocoder V in a rackspace I realised I hadn’t had the Motu M4 inputs selected as my Input device. I corrected that, but after a few while I noticed that when changing rackspaces I was sometimes getting a "fluttering sound’ when i hit the first notes after a change.

It seems quite random, can’t pin it down to any particular rackspaces or VSTs.

As i had a gig in a few days i changed the input device back and all was well again.

I now have had some more time to test, but are getting the same results.

Any thoughts would be most appreciated.

Thanks
Matt

How looks the “Input Muting” in the rackspace properties?

Where did you include the Vocoder, in a local rackspace or in the global rackspace?

OK, that could be it. It was not something I was aware of. It appears some rackspaces were set to 0.0, and others several seconds.

I will do some more testing and confirm that is the fix.
Thanks!

I hadn’t even added the Vocoder is this last round of testing so I’m not sure its relevant, bit it was a local rackspace.
Thanks again
Matt

I have now come back to this after being away for a week. The issue is still there on some of my rackspaces, whether the Input muting is set to 0s or 10s.

Any other thoughts?
Thanks
Matt

Ok, after some more testing the issue is not down to the Motu 4. When I have switched Audio interface to a Scarlett 8i6 I get the same issue.

Further testing has revealed that the issue seems to affect only rackspaces with B-3X in them.
Even if i don’t play the Hammond sound, the other sounds have the same fluttering for a few seconds. CPU is at most 30-40% so not extreme.

Any more thoughts?

Matt

What happens if you bypass the B-3X?

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If I bypass the B-3X the other sounds in the rackspace are fine. I was able to bypass the B-3X whilst I was playing another sound within several differnt rackspaces, and the fluttering stopped instantly.

What version of the Hammond plugin are you using?
VST or AU?

I’m using VST3

Yeah…I suspect that fluttering is an artifact being deliberately generated by the Hammond plugin. Real old B3s generated all sorts of noises

Any thoughts on getting around it? This only started happening after I changed the Audio input device to the Motu M4.

Thanks
Matt

If it’s deliberate (which I suspect) then there’s probably a parameter to control it

Still no further with this, spent several hours looking at parameters in B-3X, still no joy.
I might need to replace B-3x completely, this is starting to eat up too many hours where I should be actually playing keyboards.

It am using this plugin a lot and I do not face the issue.

Just a random thought. Have you tried turning off/down the Leslie sim and just using the DI out of the B-3x to see if that helps? I sometimes notice the Leslie makes a noise even when I dont play through it, just like they do in real life I guess.

Check the Generator Leakage setting. It’s accessed via the Advanced Button when the Organ tab is selected. That will definitely throw out some noise when nothing is played if turned up too much. Also check the gain and volume settings on the Leslie. That along with high leakage could lead to the sound you’re hearing

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Thanks for the suggestion, I have just tried setting the Generator Leakage setting to Min. I am still getting the same issue.

Thanks anyway!

I thought we had it there, but I still got the same issue, didn’t seem as much but still even with the Leslie turned off.