I am converting video files to MP4 for playback on Streambaby. It works fine but have been noticing I can't hear the spoken dialogue and am turning up/down volume during the entire video. I have Left-Right-Center speakers in my AV receiver(Sony 3500ES) but am noticing no sound of center channel. I am not using surround sound on receiver but the multi-channel stero where sound comes out of all 3 speakers. When coverting the file to MP4, is there a way to add convert the file so sound will come through center channel? I am using Handbrack and also have Aimersoft Video Converter. I need help with the correct audio settings to get sound through center channel. Please help. Thank you.