Ah, the acapella vocal. You are a brave soul. Well done, and I would be interested to hear this with light instrumentation. Suggestion: perhaps run file through noise reduction filter to minimize the background 'hiss'. Also, you can create 'soundproof' recording booths with a hearty mountain of pillows. Again, good stuff.

Believe it or not this actually makes a regular appearance in my current rotation of recreational jams. i do find myself looping the first 2:15 before the higher synth melody comes in, but the progression is welcome. Good stuff.