Apple Logic Pro /LogicExpress Discussion

On Monday, July 18, 2005, at 05:19  AM, GAmoore@... wrote:

> I have a bunch of audio pieces (from a drum loop say)... each one is 
> about 1/16 long, and when I glue them together to make a new audio 
> file I have a bunch of clicks and pops. But I go back to the originals 
> (which luckily I copied first before gluing) and there are no clicks. 
> I have concluded that Logic inserts clicks and the preferrable way to 
> do it is to not glue but instead pack a folder and loop it.

This is why there is a such thing as 'crossfading...'

Eddie
IMS



>
> I thought I was onto something by examing the audio file and hitting a 
> keycommand for page right... at times I saw some odd gaps, and then 
> tried penciling them in with mixed results.
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> > I have concluded that Logic inserts clicks and the preferrable way to
> > do it is to not glue but instead pack a folder and loop it.
>
> This is why there is a such thing as 'crossfading...'

Yep, and by the way, Logic doesn't "insert clicks". If you glue two samples 
together that weren't together before, you create your own clicks because the 
first sample doesn't end at the same amplitude as the second one begins (not 
even if you cut them at zero crossing, as I explained before, since the 
end-cut of the first sample has no influence on the transition).

Maurits.

> If the end of one
> region and the start of the next both occur at zero crossings, and there is
> some daylight between them, why would there be a pop?

Because when the waveform hits zero at an angle, then stays flat for a few 
samples, and then goes up or down at an angle again, that's a pop. This also 
explains why it doesn't pop when played separately. And why a crossfade 
doesn't help (there's no overlap).

Maurits.

all you need do is set fade in and fade out in the audio pane of the channel to a number greater than zero
the clicks and pops come from edit points that arent made on zero crossings
alternately you can open the audio clip and zero the spikes at the start or end of each clip to remove the pops and clicks
an easy to tell if the edit is on a zero crossing when the cuts are made in the arrange window is to listen for a pop or click when the cut is made

----- Original Message ----- 
From: 
To: Logic_Cafe@yahoogroups.com
Sent: 7/18/2005 2:19:57 AM 
Subject: [Logic_Cafe] clicks courtesy of Logic


I have a bunch of audio pieces (from a drum loop say)... each one is about 1/16 long, and when I glue them together to make a new audio file I have a bunch of clicks and pops. But I go back to the originals (which luckily I copied first before gluing) and there are no clicks. I have concluded that Logic inserts clicks and the preferrable way to do it is to not glue but instead pack a folder and loop it.

I thought I was onto something by examing the audio file and hitting a keycommand for page right... at times I saw some odd gaps, and then tried penciling them in with mixed results. 


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-----Original Message-----

From: Maurits van de Kamp <maurits@...>
Because when the waveform hits zero at an angle, then stays flat for a 
few
samples, and then goes up or down at an angle again, that's a pop. This 
also
explains why it doesn't pop when played separately. And why a crossfade
doesn't help (there's no overlap).


ahh thats good to know. so you get rid of pops by penciling in a 
gradual slope to and from silent sections?

> ahh thats good to know. so you get rid of pops by penciling in a 
> gradual slope to and from silent sections?

That would work, but the slope will have to be perfect, it's incredible
what ears can be annoyed by. ;o) However, as suggested as well, when
there's no overlap a fade-out and -in (or maybe even only a fade-out)
will do the same.

Maurits.