Hello Everyone- I have a Teac 40-4 with the DX 4 unit. I want to add a mixer for earphones and mic. I have all of the patch cords and main cable hooked up, where does the mixer go in the hookup wiring? Stupid question but I do not have any info on the DX-4 for hookup and my 40-4 manual does not have any info either on hookup for a external mixer. I appreciate the help in advance.