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Good, Fast, Cheap.. Pick 2
Submitted By: RandomSkratch ( 242 days, 21 hours, 56 minutes ago )
First of all, to answer the question asked in the answer part, no you can't convert an mp3 to midi and split it into various instruments. That's impossible because MIDI and audio are very very different. You could translate a single instrument into approximate MIDI notes but that quite often doesn't work very well. Secondly, to get the sounds that are used in the song, you must have access to the same synthesizer/sampler they used. You could use another instrument but it wouldn't sound the same. Best bet would be to listen to the song carefully and try to recreate it in an audio production suite (i.e. Reason, Fruity Loops, Orion, etc). I don't know what you mean by DDR style so I can't help you there. Remixing songs are hard if you don't have the multitrack recordings. Best of luck!
Submitted By: mister.joshua
That's a shame. We have speech recognition, so why not music recognition. We have standalone applications that perform Photoshop actions based on Photoshop filters, so why not standalone applications that perform "actions" based on audio filters. It's hard to believe that all videogame music is composed by hand.
Submitted By: RandomSkratch
Sorry man.  Like I said, there are applications that will try to pick out the notes within a single instrument melody but nothing of the sort for an entire mix.  How would the program differentiate between instruments?  Not all drums sound the same and same goes with anything else.  As for videogame music, yes a lot of it is done by hand (I was actually attempting to get into that field but it's pretty cut throat), but there are a number of publishers who use existing band tracks.  Unfortunate but not everyone can have the best.
Submitted By: mister.joshua
I found a huge list of audio-to-midi programs.  Some of these are $100 shareware, but maybe one allows a free trial period during which I could complete my project?  http://www.music-notation.info/en/compmus/audio2midi.html  I'll submit a new answer if I figure out any workable solution.
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Convert to midi first, and then change instrum
Submitted By: mister.joshua ( 242 days, 22 hours, 19 minutes ago )
This is the answer that came to me, but I'm not sure it will work. Is there a freeware program that can convert an mp3 to midi AND split it into various instruments? Or is there a freeware program that allows one to assign instruments to specific notes? Am posting this "answer" as another question.
Submitted By: mister.joshua
The idea here is that the "remix" would be a two step process. First convert to midi, and then perform a cheap remix on the midi by changing strings/piano/etc. to electronica instruments. It would end up sounding like videogame music...if it's even possible to do that sort of conversion to midi.
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I use Audacity , a free Music Mixer
Submitted By: majordanger ( 238 days, 22 hours, 39 minutes ago )
It seems to do it all for me. Mix , effects, multitrack, and best of all it's free
http://audacity.sourceforge.net/

I love it. I've used it to mute coughs in a lecture recording and record some of my hot tracks of the keyboard. I've mixed in my instruments with someone elses songs.
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Something like Scrambled Hackz could work.
Submitted By: mister.joshua ( 230 days, 19 hours, 42 minutes ago )
Check out this Wired article and the YouTube video linked therein.  Scrambled Hackz is a program that creates a database of sounds from any input, analyzes the sound in your second input, and then matches that new sound with the sounds in the database to recreate it.  The program can recreate sounds in real time.  It seems to me that loading a database of synth sounds and feeding Scrambled Hackz traditional music could produce a sufficiently "remixed" version.

I have no musical talent, so I don't know if I could layer loops in Audacity.  I need pure machine music.  But it should be easy to use something like MTV Music Generator on the PS2 or some open source sequencing program to add those extra effects.

Scrambled Hackz should be availabled on SourceForge next month.