ADSR Stands for Attack, Decay, Sustain, Release. There's a nice explanation here
[ http://en.wikipedia.org/wiki/Synthesizer#ADSR_envelope ]
By humanize, I mean to try and make some of the instruments sound more human, as opposed to fake sounding samples. You can achieve this through a number of methods, all nicely explained here [ http://www.zirconstudios.com/tutorial2.php ]
This song is making progress, but could still be improved.