Logic Pro bounce volume not accurate....

[Jolaff]

Is it me or the bounce volume in Logic Pro is not accurate ?

For exemple if I make one track with a synth that plays a note at -14.3 db and I lower the channel strip fader to -5 db, the end result will be at -19.3 db.

But when I bounce region in place without any normalization the audio result will be at -19.5 db....

This is weird...

[BertKoor]

Can you actually hear the difference?

[Etienne1973]

AFAIK rounding errors can occur by calculating floating point audio streams down to 24 or 16 Bit fixed point format and back up again.

[Niklashe]

Which synth do you use?

I tried to do this with ES2 and got different results each time, slight variation in volume. But on the other hand I got different result of just monitoring the synth volume each time i restarted the sequence.

Tried the same with a simple sample in the sample player and both peak and RMS was the same in three bounces.

[Jolaff]

Which synth do you use?

I did it with Serum with a simple saw wave but it also does it with a sample on an audio track and it does it 100% of the time. And I realized it does it only with bounce REGION in place, not with bounce TRACK in place...

[Jolaff]

Can you actually hear the difference?

In that particular exemple as it is only 0.2 db, no. But I'm worried it could sums up in a different situation.