There is actually a worrying bug, if i’m right, in the Nuendo record functionality.
I did talk about it inside two other threads, in the “Feature Requests and Suggestions” section of the Nuendo 8 forum.
This bug is linked, i think, to the lack of post-record buffer. I discovered it inside Nuendo 7.1.40 but i suspect it is here since a long time.
See in this example : there is no crossfade at punch out.
Punch in autocrossfade is ok, but punch out autocrossfade is wrong, it is in fact a fade out followed by a fade in !!
and here :
So here is the description :
When recording audio over existing material, a new event is placed over the previous one. If you are rerecording a small length over a previous longer take, then the new event is smaller that the previous underlying one, and then autocrossfades are applied at the start and end of the new event, to merge audio with the existing previous take.
Those crossfades are not viewable, but this is perfectly normal because they are in fact autocrossfades. Their length and curve preferences are determined by autocrossfade settings, at the global or track level.
The problem is located at the right autocrossfade : It should extend to the right of the right event boundary, but there is no audio material for it in the clip here (because there is no post-record buffer).
To say it differently, the last take event audio should be faded out after this event right boundary, but there is no more audio here in the clip to do that…
So actually, there is a fade out ending at the take event right boundary, then a fade in for the underlying event starting here.
So we do not have a real crossfade at the end of the take, but a fade out, followed by a fade in ! This can translate to degraded audio or audible merges specially for long autocrossfades values.
How to reproduce :
To hear the bug more easily, set the autocrossfade to the largest 500ms value, choose linear curves, and enable autocrossfades. (menu project, auto fades settings).
add a new track, and choose an input channel for it in the routing rack. record arm this track.
in the input channel, insert a Testgenerator plugin, and set it to 440Hz (sinus curve).
set record mode to “keep history”, then record about 15 seconds of this 440Hz test signal.
set the TestGenerator plugin to 1 KHz, and record about 5 seconds of this signal, so that the new take audio event is located approximately in the center of the previous take event.
listen to the result, you should have :
- about 5 seconds of 440 hz signal, then a perfect 500ms crossfade with the following 1 Khz signal, starting 500ms before the start of the 1 KHz event.
- about 10 seconds of 1 Khz signal, with a fade out starting 500ms before the end of the event followed by a fade in to the 440Hz signal.
As you can listen it, there is no crossfade here at the transition between the end of the 1 Khz signal, and the 440 Hz signal. There is instead a fade out followed by a fade in.
Probable cause :
I think that this bug is induced by the fact that there is no audio material available in the clip after we press the record button, (same problem after auto punch out).
Possible solution :
Add a post-record buffer, as described in this thread :
And correct Nuendo code to place the take event fade out at the right place, after the right boundary, instead of before.