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I'm sure it can be done. Some sort of recording editing equipment would work.
Someone posted mp3s for 3 minute rounds, 5 minute rounds, tabatas, etc. a while back. I actually put those on a cd. I listen to music on a different cd player while playing that cd on another.
If you have a lot of mp3's, you could probably find ones that are close to 3 minutes (assuming that is what you are using for rounds). You could find a filler song or black mp3 that lasts a minute for your rest period.
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