First of all, yes, I made sure to quantize the CD track markers before any renders or testing, but quantized CD track markers shouldn’t affect rendered WAVs from a montage that are seamless with CD Track splice markers.
Here’s what I found using only a test tone and Steinberg plugins in a montage:
I made a montage with a test tone with seamless overlap. In the montage there is no audible click or pop when playing the overlap of the two tones. I used a CD splice marker quantized to nearest CD frame to divide the montage into two CD tracks. There is also a CD track start and CD track end marker at the beginning and end of the montage.
I inserted 4 Steinberg plugins on the montage master. Studio EQ, Multiband Compressor, Brickwall Limiter, and UV22HR dither.
When I render 16-bit WAV (or any) files from a montage with the settings to “Regions” and “CD Tracks”, the resulting two WAV files are no longer seamless when I open them in a new montage. You can see that the waveforms no longer connect perfectly. When they are played back, there is an audible tick or pop when the transition is played. I attached a screen shot of both the two rendered WAV files, and the same spot if I render as DDP.
When I render a DDP image, the there is no problem. I open the rendered DDP in Wavelab and the transition is seamless and also looks perfect. The CD track markers are quantized so it rules out that problem.
What I found is that this bug happens when more then one Wavelab audio track is in use, and the plugins must have a changed parameter. My early tests using only one Wavelab track, and no parameter changes on the Steinberg plugins caused me to think there was no problem here.
After further testing with more real world settings, I found a way to recreate this problem.
It seems there is a difference in the way DDP files are rendered vs. individual WAV files from a montage. Maybe the individual WAV renders have to start and stop for each outputted file, and then the plugins must re-engage or restart, but the DDP render is more of a “live” continuous render. I don’t know but surely this problem is now exposed. It’s a very precise bug that you may only notice if you are working with gapless or continuous audio and paying close attention.
Here is a zip of my session and assets to test yourself:
In the zip you’ll find:
-The two rendered WAV files I made, they do not seamlessly connect.
-The DDP I rendered from the same montage which the two songs/tracks DO seamlessly connect
-A screen shot of each connection of which they look different when they should not
-The source test tone I used in the montage
-Wavelab montage file
Please let me know how to resolve this solution ASAP as I have an approved DDP for an important project. Now I have to render 24-bit WAV and other files that must be seamless but I can’t find a workaround because some plugins must be used.
Thank you for your time again. I hope you find the files and info helpful.