Tracks have gone out of phase.

[ski spiggy]

Hi all.
This is a really weird one. Loaded up a project to do a final check and the vocal sounded like it had a comb filter/phase effect on it. The track actually has a previous master playing concurrently with the current mixdown(I made an error ages ago and did not realise that I was mixing while a recent separate mixdown was also playing. Once I realised what I had done, I continued anyway as the track sounded good the way it was heading and I saw no reason to revert back).

I have a complete master of the song thank goodness( done at the end of the last session, prior to this problem occuring), but I wanted to adjust some of the bass guitar volume.

So basically, end of the last session, everthing sounds great. Load up project today and hit play, out of phase/comb flitler sound on the vocal. The running mix is out of phase with an earlier recorded mix which plays concurrently. But no changes have been made.

I don't think I have explained this very well, so if it reads terribly, I am sorry.

Any advice would be really great.

Thanks,
Spigg.

[Shooshie]

Is the out-of-phase vocal track comped, and if so, has any tempo been changed or has the overall mix been time stretched since it was comped?

[ski spiggy]

No. No time stretching. No anything. It worked at the end of the last session, and now with out touching anything, it's not. I worked on it trying to work out what is going on into the morning last night.
Not happy.

[HCMarkus]

Every once in a while, anomalies arise. Did you re-start and try again?

[ski spiggy]

They certainly do.
Not only did I restart many times, I opened up different time line versions of the same file. Separately saved projects. And they all behaved the same way.
It's not cool.
Some times, DP infuriates me.

[MIDI Life Crisis]

That's a fairly unique (not reported here before AFAIK) so I'm not convinced DP is (or isn't) the culprit. Some plugs (noise reduction are the biggest offenders) will actually shift audio by a couple of milliseconds. I would start by reviewing any and all processing plugs you are or might have used. Deesser?


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[stubbsonic]

I'm not understanding what you meant about the other mix playing concurrently, but as has been mentioned recently in other posts, its possible to insert a plugin that introduces enough latency (or delay) to cause what you are talking about. You could try bypassing some inserts until it goes away.

[Kurt Cowling]

If you have any latency inducing plugins you need to hit play and then stop and then play again for the latency compensation to kick in. The first "play" forces the plugins to report their latency to DP.

[ski spiggy]

I understand the,"not inderstanding". As I wrote the original thread, I was aware that it would be hard to even explain the problem well, let alone recieve a concise fix.

[ski spiggy]

Ok. MIDI life crisis. You were on the money.
I went back in my history to where the mix down track was recorded( the one that plays concurently with the current mix.... I know weird, why would you. It was not intentional but ended happening by mistake), and then just moved forward hitting play until some thing started going wrong.

As plugs were added, but not ending up actually on, the phaze issues started.

So, I went back to the current place in my history and started deleating plugins that are only programed to be used at certain times. Problem found, but not solved.
I have noticed in the past that plugs, even a seemingly clear plug like the MOTU Eq, if inserted and bypassed, can change the signal.

This should not be. And it certainly should not run clear for months, and then suddenly decide to time/phaze screw the audio. I can only think that the delay compensation of the plug in is not working when it is bypassed but it is still passing audio rather than having audio diverted around it.

I am going leave the plugs there but automate dry signal rather than bypass and see what happens.

This is not ok. If anyone has any suggestions now the cause has been partially identifed, I would be really grateful.

Spig

[MIDI Life Crisis]