direct six channel means left, right, front and rear, center and sub. So in theory 3 outs on back of card equates to 6 channels (2 per micro jack into the card / 1 per RCA into the receiver) ( 1 micro split to two rca) each serving a speaker. That input is supposed to be on its own channel. Meaning press 6 channel and then all speakers work when selected. They dont. only left front and right front work. So I tried moving it to the only other channel that had 4 RCA to try and get 4.1 (TAPE) and left the sub and center in 6 channel thinking that they would not work when tape is selected and.....everything works. Is the receiver toast?