Hey,
I’m struggling here trying to seamlessly concatenate two audio samples and so far I’ve managed to concatenate the two samples but alas, I can’t get rid of the bump at 0:21. I’ve tried with the pencil tool but I’m lost. What must I do to achieve this? I feel I’m missing a basic step but can’t figure it out. I’ve attached the audio file to this post.
I would stop using MP3. MP3, partially because of its video heritage has no fixed anchor points or structure. You could be struggling with that timing thing until the cows come home. Maybe after.
Do all your production and post production in WAV. Then, way at the end, if you absolutely have to, convert to MP3 for delivery to a Personal Music Player or Internet Upload. Neither of those is your show archive. The show archive is the last WAV you made, which you can listen to, re-edit or convert to anything else.
Koz
Are you talking about that barely perceptible tick at about 21.25? What are we listening for?
The legacy, tried and true way to slide around one of those is a very rapid crossfade. That’s how the video editors work, or do you intend this to loop forever?
Koz
If you know where the cut point is, you can make sure the in-going and out-going waves are in the middle and going the same direction.
http://www.kozco.com/tech/audacity/pix/BadAndGoodEdit.jpg
The top one is going to “tick” every time.
There is an Audacity tool to help with matching up edits and any second I’m going to find it. Koz
Here it is. Edit > Find Zero Crossings. I’ve never used it, but its job is to help you find the places where both waves are in the exact middle, the best place to edit. I think you still have to force the wave direction manually.
Koz
Missed one. Edits tick when one or both of them has DC on the blue waves.
http://kozco.com/tech/audacity/pix/DCOffset.jpg
That’s an extreme example.
Effect > Normalize > Remove DC (de-select everything else). You have to do this to the clips before you start editing.
Koz
Koz,
thank you very much for the replies.
I would stop using MP3. MP3, partially because of its video heritage has no fixed anchor points or structure. You could be struggling with that timing thing until the cows come home. Maybe after.
Duly noted, thank you.
Regarding the tips you gave me, I deleted a fraction to make the loop seamless and normalized that section, as you suggested. I’m interested on what’s the theory behind “normalization”, I don’t know what it does but it worked. There’s only a barely noticeable “fuzz” now on the file, like when you tap on a microphone. But I’ve achieved what I needed, so kudos to you!
Here you have the output (attached as MP3).
Again, many thanks!
Tony
Sometimes the right-brain takes a while to come back from interstellar space. Glad you made it through the whole thing and even better we seem to have solved the problem.
Normalize and Amplify are cousins of each other. They both change the volume of the show by changing the blue waves and paying attention to the peaks. For example if you apply Amplify > OK (default values), the show will get louder and louder until one blue wave somewhere in the show smashes up against maximum volume before distortion. As a fuzzy rule, Normalize does it independently to the left and right. Amplify does it to the show as a whole.
But buried in Normalize almost as an afterthought is “Remove DC.” DC, direct current or battery voltage can leak into an Audacity show by accident. It’s not audible and it has no business in a musical signal, but it happens – usually through some sound equipment breaking. You might not even notice it as long as the whole show has exactly the same DC, but it makes graceful editing impossible when you have to switch in and out of a damaged signal.
"Oh, John, John, John. [POP!] Marcia, Marcia Marcia! [POP!] Oh! John??? [POP!]
(With thanks to Stan Freberg.)
That’s what you probably had.
Koz