voice via serial

Hello!

I am quite beginner in Arduino. I learned how to transmit and receive figures and letters via serial, but now, I have to ask if I can transfer a voice. If a have two Arduinos and I want to receive voice(from a microphone with preamplifier) with the first and transmit it to the second. Is this possible? If it is, can you give me a programming sequence or a library? Thank you.