Where is the microphone and setting on the Samsung Galaxy Tab 2?

I was told my voice is too soft - but I have no idea where the mic is and how to boost it. Any ideas?
Cheers

Welcome to Android Central! Which Tab 2 do you have the 10" or 7" version?

Here's a diagram for the 10" version: Samsung Manual PDF - Samsung Galaxy Tab 2 10.1 wifi Manual PDF
And here it is for the 7" version: Samsung Manual PDF - Samsung Galaxy Tab 2 7.0 Manual With Specs

I think I stuffed up. It says GT-P5210, which would make it a 10" Tab3, not a Tab2.
I have checked the manual, but am unable to find anything on microphone.

So let me close this and ask the correct question.