Synth-DIY Yahoo! Groups Archives

Ghost Audio

2005-06-10 by David

I am having a recurring problem on a project I need to finish ASAP.  I
have a piano part recorded in audio.  I get an audio artifact playing
just *before* the piano audio region.  In other words, just before the
piano region plays (about 1 beat before), I hear the piano part play
for an instant (there is nothing in the track before the region).  I
have used the erase tool to erase anything that Logic may perceive to
be in front of the region.  This removes the artifact for one
playback.  After that, it returns.

Other things I have tried:  (1) automate the volume so that volume is
zero just until the audio region starts, (2) replace the audio with a
copy.  Nothing works.  Any ideas?  

Thanks,
Dave

Re: [Logic_Cafe] Ghost Audio

2005-06-10 by GAmoore@aol.com

In a message dated 6/10/05 7:47:22 AM, amgshaffer@... writes:

I am having a recurring problem on a project I need to finish ASAP. I
have a piano part recorded in audio. I get an audio artifact playing
just *before* the piano audio region.

If the noise is in the audio file, then cut the audio in the arrange page so as to lose that noise. I am not sure how the erase tool fits into this. I would just zoom the arrange window really big, and loop the first bar or two, look for some spikes move the start of the loop region so it starts from a clean place with no noise, then cut the audio file there.

If you do that, and the noise persists, it can be the "buffer flush" noise that I was talking about the other day. In that case, try starting your playback a bar or two earlier than where actual sound takes place in your song. That will allow any remaining audio in the audio buffer to be played out, and get quiet again before your real music starts. [ I have no idea how it actually works, but I think in order to have smooth cycle loops, Logic needs to store the beginning of the loop sound in memory, so when it gets to the end of a loop, its ready to play the start smoothly. So maybe if you turn off "smooth cycling" this might get rid of the noise.] I would take for granted that you need to pre-roll and post-roll any final project, then trim as necessary. Remember reverb tails and long sustaining notes shouldn't be cut off abruptly.

If those two things don't work, then try muting the entire track and seeing if you hear the noise when you play. Maybe its coming from other track you think is muted, or some midi instrument. If you hear nothing, then do it the other way - solo that track.

There must be an answer. And it won't take long to find.

Re: [Logic_Cafe] Ghost Audio

2005-06-10 by amgshaffer

If the noise is in the audio file, then cut the audio in the arrange page so as to lose that noise.

The strange thing is that the noise is not in the audio region. It occurs in an empty space before the audio region (a beat or two before).

If you do that, and the noise persists, it can be the "buffer flush" noise that I was talking about the other day. In that case, try starting your playback a bar or two earlier than where actual sound takes place in your song.

I thought something like that might be causing it. But, I start playback 8 bars before the region is played and still get it.

If those two things don't work, then try muting the entire track and seeing if you hear the noise when you play. Maybe its coming from other track you think is muted, or some midi instrument. If you hear nothing, then do it the other way - solo that track.

Did that too. What's happening is Logic is reading the region too early, but for only an instant. It then shuts off the sound quickly, creating a burst sound. It doesn't do this with any other region, only the first instance of it (and replacing it with another doesn't work ether).

I think this is just one of those idiosyncratic bugs in Logic. Thanks for your help. I appreciate it. Any other ideas, let me know.

Kind Regards,
Dave

There must be an answer. And it won't take long to find.

Re: [Logic_Cafe] Ghost Audio

2005-06-10 by GAmoore@aol.com

In a message dated 6/10/05 4:38:42 PM, amgshaffer@... writes:

Did that too. What's happening is Logic is reading the region too early, but for only an instant. It then shuts off the sound quickly, creating a burst sound. It doesn't do this with any other region, only the first instance of it (and replacing it with another doesn't work ether).

Did you try disabling all plugins on that track? What about putting another snip of audio a few bars before the real song starts? Does it do it if you open the song freshly and have not cycled or looped anything yet? Do you have any packed folders which may be hiding anything? Did you try moving the track to a different audio track to see if the same thing happens? Or Re-import the audio file, or make a copy of it, and the put the copy there instead?

I think this is just one of those idiosyncratic bugs in Logic.

THere are a lot of them, and they are growing. A number of key commands work only occasionally. I had midi reception go out... but only in Logic. If I quit logic, it worked with the amt8 in standalone mode fine. I finally had to create a new empty file and copy tracks over. Its just one thing or the other with Logic. I used to be a stable program but its the worst thing I have now.

Apple Logic Pro /LogicExpress Discussion

Ghost Audio

Ghost Audio

Re: [Logic_Cafe] Ghost Audio

Re: [Logic_Cafe] Ghost Audio

Re: [Logic_Cafe] Ghost Audio

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