Silent lead-in when copy/pasting [SOLVED]

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OurJud
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Silent lead-in when copy/pasting [SOLVED]

Post by OurJud » Thu Sep 13, 2018 7:50 pm

This is driving me mad, but I'm trying to loop a single bass kick. I zoom right in on the sound and trim it at the very second the wave form moves from the line, then do the same at the back. But then when I copy & paste the sound, the copy always has a short lead-in of silence. Is this a default or something, as I have no idea where it's getting this lead-in from, as it's not there on the section I'm copying?

I know there are other and better ways to loop a sound, but I have my reasons for doing like this, so if you could please just humour me I'd appreciate it.
Last edited by OurJud on Fri Sep 14, 2018 9:31 pm, edited 1 time in total.

DVDdoug
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Re: Silent lead-in when copy/pasting

Post by DVDdoug » Fri Sep 14, 2018 4:48 am

I'm not the best person to answer because I don't make loops, but since no one has chimed-in yet...

I'd make a short crossfade. You can make the crossfade very short (milliseconds) so it's not noticeable, or you can make it a little longer, or you could make the fade-out longer than the fade-in, etc. depending on how you like it. If you wanted to loop it 100 times (or more) that could get tedious but you could "loop the loop" and double it every time to make it more manageable.

...I don't know much about this either, but FL Studio "evolved" from an older program called "Fruity Loops", so I assume it's still very good for making loops. (It's not free.)

steve
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Re: Silent lead-in when copy/pasting

Post by steve » Fri Sep 14, 2018 8:03 am

Although you have not said so, I'm guessing that exporting to an MP3 file is involved somewhere in your workflow as that would explain the problem that you describe.

Copy and paste within Audacity is exact. If you copy 4001 samples and paste, then 4001 samples are pasted (no added lead-in or lead-out).
If you export audio from Audacity to create an audio file, then the exported file may not be an exact copy, because it is subject to the limitations of the file format. For example, MP3 files always have a bit of padding at the start.
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OurJud
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Re: Silent lead-in when copy/pasting

Post by OurJud » Fri Sep 14, 2018 9:06 pm

Problem solved

It seems when you butt a sound file up to the very start, it 'sinks' any silence behind the left-hand panel. So that when I highlighted, I was also grabbing this hidden part too. How I missed it during the trim is another matter, but just put this one down to me being a bone-head.




Thank you both for the answers.

@DVDdoug, thank you for the tips, but getting a seamless loop isn't really the issue here. I've had a detailed tutorial on doing this, provided for me in another thread. The way I'm trying to loop on this occasion is unorthodox to say the least, but as I say it is this mysterious lead-in of silence which is being copied from somewhere that's puzzling me.

@steve, no exporting/importing involved here. On this occasion I am using Aud's record feature to capture the sound file, which I'm then trimming as required. I'm sure there's no doubt a massive drop in quality, but when I can create an entire 3 min song for about 2.0 mb in this fashion, compared to downloading and importing a bunch of 5 second loops at approx 4.5 mb a time, then I'd rather do it this way.

So, just to reiterate, I record the sound, trim it front and back, then select the whole thing and 'repeat' X times. When I do this, each of the 'pasted' copies have something like a 1/4 lead-in of silence. It's very odd.

The bite on the right is copied from the one on the left.

copy_glitch.png
copy_glitch.png (14.29 KiB) Viewed 125 times

steve
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Re: Silent lead-in when copy/pasting [SOLVED]

Post by steve » Sat Sep 15, 2018 10:55 am

Arrows at the start of the track indicate there is audio before time=0.0
(See https://manual.audacityteam.org/man/aud ... _the_track)

To see the exact time that is selected, look in the Selection Toolbar (https://manual.audacityteam.org/man/sel ... olbar.html)
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