The 4x 8x over sampling switch is underneath the HDCD series III board. un plug the DSP7000 and use a small screwdriver to switch the 4x/8x. 8x--push towards back panel, 4x is towards front panel.
output voltage is changed by HDCD dip switch. #12, when #12 is closed = higher output. HDCD dip switch #11 turns on and off the re-clocking circuit--set to closed for re-clocking ON. On the DSP7000 all the other switched (#1--#10) should be OPEN.
hope that helps.