adding cd changer to pc without bus
i have given up on trying to controll a cd changer from the pc (unless anybody has come up with a way) but i have a fm modulator unit and a sony ten disk and i am thinking i can come up with some way to provide power to the modulator when i press a changer button on my touchscreen and switch to a input on my sound card. i can then change disk etc with the modulator unit. what i need is a front end software that has buttons for a changer and a usb soundcard i can switch inputs on and some way of turning the changer on and off. does this sound like a worthwhile option or does anybody have any ideas?