Connecting Microphone

Global – Audio in ---
1-Audio in Mic
2-audio out – Left + Right
3-Mic – VP – Mp3 –to Left + Right

Tried two different microphones. Both work when I plug them into Vocal channel of the Bose Compact.
Plugged Mic into Mic impute (rear of keyboard) Tried ¼ inch and XLR

Mic controls on top right of keyboard
Pressed Mic on and put volume up, no sound.
Both Microphones work direct in the Bose; I followed the directions above –
What am I doing wrong

Grrrrr, help John C.