Problem with "plugin warm up" function (bug)

I’ve duplicated the last chord of a clip to another track, applied a fade-in and added a reverb (100% wet). The intent was to lengthen the end a bit. After some adjustments it sounded fine to my ears.
To my surprise, the rendering was a total mess! Because the reverb was started with content from the the wav file, which was preceding the edited clip.
I found out that I have to set the plugin warm-up time in the global settings to zero.
This is a work around, and I’ll leave the setting like this. But wouldn’t it be better, if the plugin would be feeded with silence during “warm-up” and only work with material that is part of the edited project?

Martin

I need more info to figure out your case.
Where is located your reverb? Track or clip? In the later case, are you using the Tail option?
What do you render? Clip or Title, or?..

The reverb was located on the clip in this case.
Tail option was activated.
And the montage was used as a submontage.
I suppose that the reverb on the whole track wouldn’t have made any problem, it would start from the beginning.
Anyway I didn’t expect that playback and rendering could have so completely different results.

Do you mean you hear the reverb tail in the super clip?

No.
When the playback of the clip starts, the reverb is already feeded with material from the wave file, which isn’t part of the clip (but before). In this case, a loud chord which preceeded my edit point.
And this happens because of the plugin warmup default setting (500ms).
The plugin warms up with material, which is not present in the montage.
And I didn’t expect that, because it doesn’t do that in playback mode.
I think, the plugin should warm up with silence, when positioned on a clip.
As it would do this, when the clip starts at the beginning of the file (?)

You say:

But you said earlier:

I didn’t expect that playback and rendering could have so completely different results.

Hence what is the difference you observe between playback and rendering, and what do you render?

I have tried to reproduce your case with a simple montage, but I could not succeed so far.

Maybe this screenshot explains it better?
Bot clips contain the same wave-file. Track 1 is dry.
The reverb should start with the faded-in tail on Track 2. But in fact, when the clip sets in it already reverbs the big chord, which is in the file (left to the editpoint). And this has to do with the warm-up time.

So, you mean (from your picture) some audio of audio of track #1 is leaking to the start of the bottom click (?).
I still can’t reproduce this…

No, not leaking!
But the clip below contains the same material as the one above. if I’d grab the left edge and drag it further to the left, you’d see the same material as in the clip above. And the problem is, that the plugin in warm-up phase accesses this invisible content.
It would only sound like it is processed in the playback, if I’d bounce the dry second clip to a new (short) one, before I apply the reverb. (Or reduce the global warm-up to zero, what I did)
I think, the plugin should warm up with silence, and not with material that is cut off from the clip.

1 Like

With your last comment and picture, the case is now clear.
The purpose of the warm-up procedure is precisely to avoid any sound discontinuity at the beginning of a clip, as a plugin might otherwise “start from nowhere.” To achieve this, WaveLab is designed to feed the plugin with audio preceding the clip, if available. This is exactly what you have criticized. Therefore, the only solution is what you have done: disable the warm-up time.

1 Like

Can this be fixed by introducing consolidate/crop clip (like how in Ableton)?

Can this be fixed by introducing consolidate / crop clip (like how in Ableton)?

Please don’t answer when you don’t understand the topic. This adds confusion to a thread.

4 Likes

Okay Noted. Was only thinking the other way around from an editing perspective.

Ok, if this is intentional I can take it like this.
But shouldn’t playback include this warmup time as well? If I heard what will be rendered later, I could have adjusted my edit as needed…