I have a 4 diff map http://osu.ppy.sh/s/48936 the first 3 are instrumental and the last diff is the original song with lyrics but was done by another artist, now can i still use the lyric song or will that cause problems in the ranking process?
If you are mean using 2 mp3 of a same song that one of it is only instrumental and another is with lyric, then it should be fine, I've seen this kind of beatmap before, and there's no ranking rules said it's not allowed