Subject:problem with track sync when rendering to final WAV.

Posted by: djdsk

Date:9/23/2002 5:25:41 PM

Anyone got this problem?

Using ACID 4 to create mix cd's done a 30 min mix with 11 3min song all beatmapped to sync.Sounds perfect when played in ACID 4.

WHEN I RENDER DOWN TO MY FINAL WAVE THE TRAX ARE SHIFTED SLIGHTLY OUT OF SYNC TO MAKE THE MIX SOUND VERY UNPROFFESIONAL.

Can anyone help its driving me crazy. Help much appreciated.

DSK

Subject:RE: problem with track sync when rendering to final WAV.

Reply by: SonyNateM

Date:9/23/2002 5:33:50 PM

DSK,

Upon render, my songs all stay in sync everytime. What format are the files you are mixing? Do you have tempo/time sig changes? What format are you rendering to?

Nate

Subject:RE: problem with track sync when rendering to final WAV.

Reply by: djdsk

Date:9/23/2002 6:45:59 PM

Hi ,

All of theese songs were ripped from audio cd , i am using volume envelopes on all 11 tracks and effect sends on some of the channels.

Around 20 mins into the mix i have a tempo change from 82 bpm to 95bpm .

As a test i rendered the 11 tracks to construct a final wave in a new track and comparing it with the other tracks i could see it does not keep in sync with the original tracks.

Although it is only slightly out of sync it notices, and the guy i write songs said the same.

I have rendered to an mp3 and wav both with the same problem , is there any options in the audio i could tick to mend the problem.

Has anyone else had this problem?

Thanx for the help

DSK

Subject:RE: problem with track sync when rendering to final WAV.

Reply by: djdsk

Date:9/24/2002 9:17:02 AM

Sorry to i need to put this back to top as im going mad trying to solve this.

Subject:RE: problem with track sync when rendering to final WAV.

Reply by: SonyNateM

Date:9/24/2002 10:22:21 AM

Are you sure you have EVERY track PERFECTLY beatmapped? If one is slightly off by the end, then it's going to drift, albeit every so slightly, but it's there. Like being the tiniest bit off with the pitch control on a turntable. While it may sound great for 45 seconds afterwards it just gets worse.

I would scroll way past the end of your mix, then paint out the full length of each track, zoom in near the end, and visually check to see that the song's beats are still matched with the ruler marks in ACID.

Let me know if this helps.

Nate

Subject:RE: problem with track sync when rendering to final WAV.

Reply by: djdsk

Date:9/24/2002 11:23:46 AM

Hi ,

The thing is some of the tunes i have used are not electonic so pitch varies slightly , but all i want is to reneder what im hearing in ACID to an exact wax,but the final wav does not resemble as what im hearing in ACID.
For example the first track is a 4 min song , half way through it i have placed in Track 2 8 bars of another song and 4 bars of different parts inserted via the beat chopper . When i zoom in on track 2 all snare drums line up and it sounds perfect in Acid .

Then the last 8 bars of the song in Track 1 the song in Track 2 comes in and the Song in Track 1 ends.Again zooming in all snares line up and sounds perfect in ACID.

I then render this down to a final wav and its all shifted slightly out of time.

Today again i beat mapped a song and rendered it down to a new Trak and the wav in the new trak is slightly shorter , for example they both start in perfect sync but at the end of the song the wav in the new trak is Slightly faster.

Is ACID the right kind of program for what i am trying to do?

All your help is appreciated .

DSK

Subject:RE: problem with track sync when rendering to final WAV.

Reply by: Iacobus

Date:9/24/2002 12:21:03 PM

When you bounce down (render) several tracks into one, have you tried setting the new track as a One-shot instead of a Beatmapped track? (Double-click the newly rendered track's track icon in the track list and change the Track type from Beatmapped to One-shot.)

One-shots never change pitch/tempo across a project that has such changes but Beatmapped tracks do.

I don't think that will help much, but try it anyway.

Iacobus

Subject:RE: problem with track sync when rendering to final WAV.

Reply by: ericj

Date:9/24/2002 12:28:43 PM

Here's a test to help:

Try creating a 10min mix of just loops...not entire songs. Then render it to .wav and see if it drifts.

What's odd is that it sounds perfect while playing in Acid...then gets all mucked when rendering. Also, did this EVER work perfectly? What if you take the .acd and media files and try it on another machine?

You may want to give SF:

Acid version
RAM
OS
Chip
Soundcard
driver version of soundcard

I used to work in Tech Support so I get kinda nitty gritty.

:+)

-Eric

Subject:RE: problem with track sync when rendering to final WAV.

Reply by: SonyNateM

Date:9/24/2002 1:01:45 PM

Hmmm...

I just created a 15 minute mix containing four tracks of mp3 and wav files, a few tracks mixed at a time, lots of volume and pan envelopes. I listened to it a few times to make sure everything was beatmapped and synced. I then rendered to a WAV file, and dropped it back into the project alongside the mix. When I play it back, not only is it still in sync, but it's right on. I get summing of the waveforms, and no phasing whatsoever.

Are you using any effects?

I am using ACID 4.0a, have you downloaded the update yet?

Nate

Subject:RE: problem with track sync when rendering to final WAV.

Reply by: SonyNateM

Date:9/24/2002 3:53:18 PM

I retract what I said above. I have isolated the bug. It seems to only occur when you have "Preserve pitch when stretching" ticked in the track properties for your beatmapped file. I have notified our developers and we will be working to fix this.

Thanks for all the info! We will take care of it as soon as possible. In the meantime, the only workaround would be to not preserve the pitch of your tracks (I don't know if this is a possible solution for you.). Or, you could do you time stretching in a non-real-time app, such as Sound Forge. Just beatmap the track, note the original tempo. Open the track in Sound Forge, go to Special>Edit Tempo, and specify the tempo you noted. Now, you can just use the Time Compress/Expand function to stretch to your new tempo and save your file.

Nate

Subject:RE: problem with track sync when rendering to final WAV.

Reply by: djdsk

Date:9/25/2002 5:46:37 AM

Thanx im glad the problem is isolated please let me know when the bug is fixed, many thanx

DSK