Live 10 and UAD Plugins - Bug

[taka_perry]

Hi

I’ve encountered an issue when using UAD plugins inside Ableton Live and wanted to see if anyone has the same issue. It does not occur in Logic and doesn’t occur in Ableton with native plugins.

When I load up a project at any buffer size everything plays back fine, but as soon as I increase or decrease the buffer size, all my tracks containing UAD plugins get pushed out of time by varying degrees, depending on how many UAD plugins are on a particular track.

Upon closer inspection, the issue is that the latency of the UAD plugins (at the bottom bar of Ableton when hovering on the plug-in) does not update when changing the buffer size, and thus the plug-in delay compensation in Ableton is not compensating by the right amount.

What’s even more bizarre is that latency of the UAD plugins seem to be one step behind the buffer size selected within Ableton. So for example, if I launch and load a project at a 512 buffer size, the UAD plugins will load up with 512 samples latency, then when I change Ableton buffer size to 1024 the UAD plugins remain at 512, but then after changing the Ableton buffer size back to 512 the UAD plugins will then update to 1024. So essentially a cat and mouse game of latency.

The current solution I’ve found is to set the buffer size to what I want it to be and then restart Live so that it loads the project up at that buffer size, but this is time consuming. Also bypassing the UAD plug-in off and on after a buffer size change fixes the issue, but once again time consuming if working on a large project with 50+ plugins.

Wondering if anyone here has any similar experience with this issue and if there was any solution they found? For reference I am running an Apollo X6 on a 16” MacBook Pro.

[Shift Gorden]

Very interesting. I haven't noticed anything (Apollo X4, 16" MBP) but I'll definitely look. I use both Live and Logic and I haven't picked up on any differences. How odd. I will say, the UAD/Apollo side of things can be a little mystifying at times - I'll check this out later and report back.

[taka_perry]

After a bunch more experimenting, I've found that using the AU version of the UAD plugin rather than the VST version fixed this issue. Still weird that it exist though, but I can live with this solution.