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This shouldn't be all that much different than doing an original track. The only real difference is that you may have some samples to work off of and you generally know what key or compatible keys you can write the track in. If you are using samples from the original track, then you'll obviously have to either write your track in the same or a compatible key, or pitch said samples up or down to fit whatever key you decide to write in.
A MIDI file might be helpful, but honestly, most producers can figure out the parts without the file. I'll usually just bang out the parts on the keyboard to figure out what key the original track is in.
Also, you'll most likely need the original parts without any effects, as sample from the original tune usually produces unfavorable results (with a few rare exceptions).
Oh yeah, one other very important thing you'll need: permission. Anyone that is asking you to do a remix should provide you with the remix stems.
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