3 question on EasyVR Shield

1.-When you use the EasyVr Command, what does it store?intensity of the sound in voltage (y axis) against samples (x axis)? 2.-What is the transfer data between the tx and rx wires connecting arduino and the EAsyVR shield? 3.-for example when I forward, the easyVr shield compare the forward to the stored commands. If one similar to forward, the EasyVr shield send the address to the arduino which is the first voice command so 0000 0001 is send from the tx pin of the EasyVr shield to the arduino.

Datasheet: http://www.veear.eu/downloads/