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What im trying to do is if for example if i have an audio file where a person says "Today", i could isolate a sound like the "o" sound and extend it as a tone for any length of time.

So for "goal" it goes to "ooooooooooooooo".

Any help would be very appreciated. Thank you guys for any help in advance.

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It would be difficult to do. You may try Audacity –  Jack L. May 23 '13 at 19:30
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Software-rec questions are generally off-topic, so I've modified the title slightly. –  NReilingh May 23 '13 at 19:38
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2 Answers

This could be done with a piece of hardware or software called a sampler, but you should be able to accomplish the same with any waveform editor--or a combination of the two.

Essentially, you will be "cropping" the audio file in order to isolate only the tone in question, and ideally in a way that sounds the same both at the beginning and end of the fragment. Then you would simply loop that fragment.

The graphical equivalent of this would be to start with a family photo, crop it to your head, and then tile the result as your desktop background. (Sorry, couldn't resist.)

Samplers in particular are used for playing back loopable fragments, often with some special other modifiers like pitch, attack, release, and decay modulation. You might use one to make a special sound for your MIDI keyboard consisting of a number of individual sounds layered and looped in a unique way.

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Most transcription software will automatically loop; or at least easily let you loop a section of audio such as someone making the "ooh" sound in "Today". It will do this easier than a full-blown waveform editing program.

Doing this inside transcription software will save you from having to manually edit the track, loop it, etc. These programs will allow you to simply highlight the section of waveform you like, and through most defaults automatically start playing back the audio looped over and over. And over.

This can be done as suggested in Audacity and other audio programs, however I find it's just simpler to highlight the selected part of a waveform, hit the space bar and hear that section of audio over and over again.

My experience with this is mostly in Transcribe!, or Capo, but they all act similarly.

Now, when you want to export this away from the transcription software:
However, the audio will probably "clip" in the sense that the noise starts over, and will have an abrupt beginning. In that case, copying and pasting the audio clip inside an editor and Cross-Fading should leave a stream of vowels as indefinite as you like. Or any pitch for that matter. Visual of cross-fading

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Good note about crossfading. Another trick I've used on occassion is to zoom very very far in and make sure that the end of the segment is the same phase as the start of it. For a fairly consistent sound it means no clip, but if the tonal qualities change abruptly the it's not sufficient. –  Matthew Read May 24 '13 at 19:08
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