Hi, basically, the final idea is to build a website where I have 2 parts:

Mixing/Music part.
Video part.

The idea is like a snowball, I began thinking about 2 simple things and now I'd love to do an interactive experience with a song, mixing it live.

My most important doubt is, how do I put different wav stems (parts of a song divided by instruments, ex:kick, snare, synths.) and play it all at once when you decide and enable and disable it with keys.

Okay, in the video part I want to layer videos that get enabled by pressing the same keys, each video is linked with a sound. If you enable one sound the video is visible...

The question is, what should I use to make the player/mixer??