CD Audio-Adder allows you to connect two internal CD devices to one sound card. Great for use when one of your drives is recordable. You can check the quality of finished CDs by direct playback without changing drives. Separate processing of both stereo channels; no change in frequency response. Protects against mutual interferance, short circuits, and faulty connection to sound card and second drive. Fast and easy processing with music programs in combination with appropriate player software. Sound card end has both MPC and 16 bit Soundblaster: compatible connections. Cdrom drive end connections are MPC, which will work with any IDE 4 speed on up. Plug and Play.