say that i wanted the background music from a movie trailer, is there a way that i can remove the voices and the sound effects and just have the music?
Try this:
Bring in the stereo file. (It has to be stereo.)
Duplicate the audio... crtl drag it.
Set the switches on that copy to "center" (something like that). You want both channels summed into mono... and then that mono signal goes into both stereo channels.
Hit the invert phase button on the track controls. This will set that track to cancel out sound.
This can work since dialogue and vocals tend to be panned center. Music is panned L/R stereo. So by doing that trick, you get rid of the mono elements while keeping the panned elements.
Why our software can't separate vocals from a song for remixing.
Question:
Can I separate out just the vocals from a song to remix it or make a karaoke version?
Answer:
After music has been mixed it can be difficult - if not impossible - to isolate specific elements of the audio mix and remove them without drastically changing the overall sound. The various instruments, vocals, etc., are combined into left and right channels in the stereo field. After this, it is only possible to adjust volumes for certain frequencies using EQ. Instrumental versions of songs that are commercially produced are made by removing the vocal tracks from the mix before final mixdown.
There are some DirectX plug-ins available that are labeled as vocal removers. These work on the basis that vocals will be located right in the center of the stereo field. They drop out everything mixed right in the middle, which can sometimes take out the vocals. Unfortunately, it would also remove any other instrumentation mixed in that same location. Also, if there is any reverb, chorus, or other effects applied to the vocals the whole process usually goes awry.