examples: refactor floatpcm2mp3 example a bit
examples: refactor floatpcm2mp3 example a bit

EQ4/node-lame,TooTallNate/node-lame,mcanthony/node-lame,dag10/node-lame,EQ4/node-lame,PlayNetwork/node-lame,dag10/node-lame,PlayNetwork/node-lame,EQ4/node-lame,PlayNetwork/node-lame,dag10/node-lame,mcanthony/node-lame,TooTallNate/node-lame,mcanthony/node-lame,TooTallNate/node-lame