Sub-montage, external processing and buffer bug

[Storm_Mastering]

Hello,

I posted last year about a bug happening sometimes, and I guess I found the culprit.
I made a sub-montage with pink noise, and put external processing “plug-in” in inspector. On the analog side is only a soundcard roundtrip. I also tried as render through master section and had the same effect.

Firt, try the plug-in stock

And render. It is as it should, with the roundtrip delay.

Let wavelab detect the latency

Then render. You see there is a gap, it’s exactly 256 samples here, the size of my audiocard buffer.

If manually, I try other latency, it works as it should up top a point. Exemple with 19 ms, it bugs also : audio starts at 2 ms as it should, then another 256 samples of silence.

Until last week, I did not had my previous problem in 6 months (random 256 buffers of silence inserted on rendered sub-montage through external processing) but since I insert 1sec of silence at the beginning of everyfile, I did notice that small bug but didn’t care for it as it was harmless. Now I tend to think it may be linked.

I tried with the option “reset plugins before render” both on and off and it’s the same.

edit: can’t embed pictures for now

[Storm_Mastering]

Edit : upload is sorted now, thanks

[Storm_Mastering]

Adding to the topic, is there a way to make Wavelab stop rendering and prompt an error if it detects a drop-out ? Like Cubase does on real time rendering for example ?

[Storm_Mastering]

I also found the old topic about the issue.

Weird audio drop problem

Hello, First for starters, the way I’m using wavelab for mastering. I import all the tracks and transform each one in a submontage, two times. The first montage is digital preprocessing with external FX (analog loop) as last insert. The second one “catches” the render of that first montage and get all the post processing + digital limiting as last insert. The mother montage “catches” all the limited and finished masters, and in that montage I edit clips, markers, fades, etc. Lately, I chan…

[PG1]

@Storm_Mastering

Now I tend to think it may be liked.

What do you mean?

[Storm_Mastering]

Spelling mistake, I meant “linked”

It does the same issue : a buffer length filled of silence. One is everytime at the beginning of the render as on the picture. The other is random place in the render (and I didn’t have the bug occuring for 6 months, but had one last week). Both cases, Wavelab renders as if everything is OK, and searching / checking inside the files if there is a drop is very time consuming.