New
#11
It sounds like you do in fact need the microphone input part to have voice. Just what is the make and model of the microphone anyway? Do you know? Look up its manual online if you can. You should see a schematic of some sort.
If you're using a computer as part of your DJ equipment, the microphone is what you use for voice. Line in needs to be amplified.
I have two "police scanners" on left and right line in and can hear them on the computer. But! the scanners themselves amplify the output line out.