Usage of cvlc with coproc

I'm trying to feed to file descriptor .mp3 files the with the dummy interface of vlc, i.e., cvlc, in order to add to a playlist on the fly or override the entire file descriptor with new data (new .mp3 file):

coproc cvlc
cvlc filename.mp3 >& OR >>&"${COPROC}"

This will run but will wait for the prompt to back which is not expected since its directing output to file descriptor.