Hi,

I have compared Bounce to track option with Fast Bounce enabled and disabled and here are my results.

Remark: in this case, I am running Win7 32bit and Sonar X1d Expanded 32bit.

Project: 22 tracks, 15 buses
Plugins: Voxengo Gliss, ProChannel, Voxengo Curnchesor, Redline Reverb, Vintage Channel

Running  48/24 resolution.

I have checked multiple times the correct routing from tracks to buses and to the MAIN output. 

I go to Bounce to Track menu and choose:

Source: Main Out
Channel format: Stereo
Dithering: None

Source bus/track: M16DX OUT 1-2 (the only option)

Mix Enables: all checked

I bounce the mix with Fast Bounce checked and with Fast Bounce unchecked.

Then I routed these two new tracks to a new bus and the bus directly to the main out. Muted the Non-fast bounce track, flipped the phase of Fast Bounce track and played the project. I heard loud and clear mid to high frequency part of the mix. It should have canceled each other, right?

Then I muted the Fast bounce track, unmuted the Non-fast bounce track, flipped the phase and played the project. Silence. Perfect match.

As the only difference between the two tracks was the Fast Bounce option, I conclude Fast Bounce degrades the audio quality, mainly in mid and high frequency spectrum.

Could be the difference caused by the plugins not performing the same when Fast Bouncing and Non-fast bouncing?

Deleted.
 
Must learn to read OP properly before replying...

They should be identical providing all other factors are equal, and it's that last bit that is probably causing the difference.

Are you running any plugs that can produce random time shifts, like Chorus, Flange, LFO's etc.

Unless they are all in exactly the same phase relationship for both bounces, then you're going to get differences

I am running only those plugins listed in my first post. The setting are the same for both bounces. The only difference is Fast Bounce option. Then I compare the bounced file to the original mix, not the two bounced files.

Now I comparing Fast/Non-fast in a test project with only one track and one plguin (Gliss EQ). So far the results are inconsistent.. :)

So, a new project, one piano track, the track is directly routed to the MAIN OUT. In the FX bin there is one instance of Voxengo Gliss EQ (version 3.2, there is a newer one, I will try that). I have boosted at 7k by 12db.

Fast Bounce options are the same as stated in my first post.

Results:

Fast Bounced track, flipped phase - mid and high frequency loud sound
Non-fast bounced track, flipped phase - silence

EDIT:

same results with the newest Voxengo version - 3.5.3

Just tried approximately the same frequency boost but with Pro Channel EQ.

The Fast Bounced track canceled out with the original track.

So, the Voxengo plugin is not "Fast-bounce" ready...

At least I know for the future :)

Interesting. I mostly use fast bounce ...which in some cases is not really so fast. 

I have never done a comparison like you did. 

I will have to do some research and perhaps use the slow bounce/export even though it takes much longer. 

If the results are better... it's worth the wait. 

That's disturbing.

Aren't some of Cake's plugs rebranded Voxengos?

From now on, I will rely only on "Slow" bounce. This way I will be sure (at least I hope) that the exported file is 100% the same as the original. I do not have time to check every plug-in if it is or not "Fast bounce compatible".