Bare with me as I only know a little of what I'm talking about 
I'm thinking I want to try to make up some mixes of various mp3s (or other format), matching them to a constant beat (and obviously outputting to a file)
Preferably, if it's something that can automate some of it would be great, as I kinda know the concept of what I want, but not the detailed mechanics (obviously from my questions
)
Even something that can tell me what the bpm of a track is so I can try to manually adjust would be good.
Does something like what I'm talking about exist?
I'm thinking I want to try to make up some mixes of various mp3s (or other format), matching them to a constant beat (and obviously outputting to a file)
Preferably, if it's something that can automate some of it would be great, as I kinda know the concept of what I want, but not the detailed mechanics (obviously from my questions
Even something that can tell me what the bpm of a track is so I can try to manually adjust would be good.
Does something like what I'm talking about exist?