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Possible Duplicate:
Join multiple MP3 files (lossless)

I need to join hundreds of small mp3 files into one.

I know there are several mp3 cutters and joiner tools, what I need is their start/end points get mixed/overlapped. One should be able to specify time span in seconds, that will goes fade in / fade out / intermixed / overlapped over another.

I need to be able to do it in a batch. Any solution must be free.

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d-coder
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    I don't think this question is remotely related to SO but nonetheless, you could use cat foo.mp3 >> Merged_Song.mp3 in a bash script if you are working on Linux or copy using + on Windoze. This will however not give you any control on fade or time span. You could cat a blank mp3 of the amount you want after each song if you want a pause. I'm not sure how to implement fades. You might want to look at Audacity's Batch Processing mode. –  Apr 01 '12 at 11:34
  • Search before you ask. –  Apr 01 '12 at 12:15
  • Well I've been trying various suggestions from you people, unable to find a way to overlap their ends. OK let me correct the words, I actually need to cross-fade the mp3 files along with joining them into one. Normal Joining is not a pain for me. I have even programmed my own tool to join mp3s, can't just cross fade them. Any suggestions? – d-coder Apr 01 '12 at 18:03

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