Another newbie with noise issue.
Roland FP7 keyboard.
Behringer 802 mixer.
Behringer UCA 222 usb interface.
Desktop Win 7 with Reaper.
Two 1/4" balanced ( ? two black rings ) from keyboard line outs to mixer line ins.
Keyboard volume at 1/4.
Mixer channel volume at 1/2.
RCA jack from mixer...