828 problem with vocoders

[songman]

Apparently often the 828 cannot handle several vocoders at the same time. I sometimes like to have 2 or 3 vocoders working simultaneously in Logic 10.8.1 and all of a sudden it happens that one or two of them start crackling, have garbled output and have audio coming very late after the original vocal (several seconds). The only way to get them back in line and working normally again is to switch the 828 off and on again. Anyone witness this?

Mac mini M2Pro, Sonoma 14.7, Logic 10.8.1

Vocoders: Waves OVox, Orange Vocoder, EVOC 20 PS

[dgatwood]

That sounds like a CPU performance issue, probably compounded by a bug in the vocoder plugin where the buffer becomes larger every time the data isn't there on time, but without properly updating the plug-in latency in the audio unit graph so that the rest of the system knows that it is spending longer processing that audio unit.

Turning off the interface has the effect of resetting the entire Audio Unit graph, which forces the plugin to start from a clean state again. Quitting Logic should have the same effect.

I would suggest bumping up the buffer size/latency setting and see if that helps. I'm 99.999% sure that this has nothing to do with the audio interface itself.

[songman]

Thanks for your interesting comments. I guess you are right, next time it happens I'll switch Logic off and on instead of the 828. Since that computer with Logic only serves as a VI machine piping the sound to another older computer with Protools HD10, TDM, I do not think it can be a CPU problem. Actually I witnessed CPU usage with the Activity Monitor and it is always way low. But good suggestion to switch Logic. Happens seldom, so might be awhile before I can test.

Cheers, Bob.

[songman]

I'm 99.999% sure that this has nothing to do with the audio interface itself.

Guess you are correct here. It now happened with another computer and an RME FF800 interface too.

[mikehalloran]

The following Terminal Command will free up cached memory. It will ask for your Admin password after you hit the Enter or Return key

sudo purge

It's not as complete as a reboot since it doesn't quit active applications but I would try it after quitting Logic and seeing what happens.

[songman]

Thanks Mike, only just now saw your response!