i had problems with vocals on 4.06 playing vcd's and these are the few steps i took
i used
a single cable 1/8 to 1/4
trs cable,and you'll still get a stereo effect ( both speakers working )and no vocals, do not use a
single cable with a y adapter( for l/r channels ) it will not work, you will get vocals, and also do not use a
single 1/8 to 1/4 mono cable, only one speaker will be working..hope these will help some people with vcd ( video vocal problems )