I am running into the same problem as posted by Surendra.
When I played back the file recorded on am335x on a PC host, it is the same result. No audio heard (just backgroud noise, eventhough I was shouting/speeking into the Mic during the recording on am335x board).
Same arecord and aplay cmd generate a good recorded audio clip with my "Ubuntu+linux" machine. The recorded audio in this case playback well with the expected recorded sound.
Is anyone can help here or been through this before? I am suspecting a missing Microphone device configuration in my am335x!!