asked Nov 29 at 23:10 by RichardC (63)

If you push the Peak Limiter really hard and then pan a little left or right, the audio breaches the limit and clips the track. Is this a bug? Can anyone else reproduce this?

In Bitwig, a signal which peaks at 0 dBFS panned center will peak at +4.3 dBFS panned fully to one side or the other. The mixer adds or removes gain from each channel (left + right) when panning to make the track seem equally loud, regardless of how it's panned - if it didn't, the track being panned would seem quieter than when it was panned center. This concept is called "pan law". Some DAWs allow you to select which pan law the mixer will use, if any, while in Bitwig it seems to be hard-coded, at least for the moment.

It's also important to note that the device chain is pre-fader in Bitwig. When you apply a peak limiter in the device chain of a channel strip, it limits the signal before the pan knob affects gain for each stereo channel independently, and the fader applies gain to each stereo channel equally.

Since this has nothing to do with the peak limiter itself, you'll get the same result using any limiter, including those mentioned above.

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answered Dec 04 at 15:34 by jstrum (46)

Thanks jstrum,

I guess I hadn't really thought of the pan control as being post device chain. But it's obvious if you think about it! Thanks for your detailed answer.

  — (Dec 04 at 16:58) RichardC

Cool! Very informative answer.

  — (Dec 04 at 21:56) djx

Yes. I can reproduce this behavior, but I dont necessarily think its a bug - just a limitation (pun intended). From what I know about how limiter algorithms work they look-ahead and sample the level and decide how to enforce the limit. Lower latency devices (like the peak limiter) sample less often, so there is more chance the will let some peaks through when you push them hard. Why this happens more when panning slightly off center could just be a limitation of a simple limiting algorithm that works on a linked stereo signal. More expensive limiters like those from fabFilter or DMG Audio have many options for dealing better with extreme limiting or for doing it more transparently with less artifacts. But when you want a simple low latency limiter that you can use on every track, the bitwig peak limiter is an excellent choice.

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answered Nov 30 at 12:13 by djx (274)

edited Nov 30 at 12:15

Thanks djx for your 'low latency' answer :D

I would hope that a brick wall limiter would not let anything through, even when pushed very hard. The bit I find strange is that this behaviour only happens when you pan more than 4% left or right. I'm inclined to think this is a bug. If it isn't, it would be great to have an explanation from Bitwig.

  — (Nov 30 at 20:08) RichardC

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Asked: Nov 29 at 23:10

Seen: 116 times

Last updated: Dec 04 at 21:56

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