How I Did It
Tools I Used
MusE sequencer http://www.muse-sequencer.org/
Om modular synthesizer http://www.nongnu.org/om-synth/
Sweep sample editor http://www.metadecks.org/software/sweep/
All on GNU/Linux
Process
All notes mouse edited. turned off grid snapping for manual swing-feel / humanization.
Sounds generated with custom patches for Om, no samples used at all.
Sweep sample editor used for normalization and cutting the silence off the ends of the tracks.