audio input and sampling via altera DE1 kit using SD card

Hi,

here are the question i facing when using SD card as input source in altera DE 1 kit

1. How do i able to read a .wav audio file in SD card using FPGA kit via Verilog HDL coding?

2. How do i able to sample the audio's sampling frequency?

3. Are I able to mix 2 audio files together via using FPGA kit or i need to mix it before i insert the audio file into the FPGA kit

4. How to implement megawizard into the coding??