MADE FOR AN VERSION 2.0, NOT PORTED TO AN 2.1 YET
Major changes to many of the nodes to reflect my improving knowledge of AN and Python. All nodes are now colour-coded to reflect which category they fit into. These are some new nodes, the operations of which is not yet described on my website. There are also some bug fixes in the Bones nodes, mainly to pass the bone(s) through to the output socket. This did not work in some circumstances and has been corrected.
The main Variable Node is the var_attr_store.py file, the other var... files are for collaboration purposes and have some issues that make them "not ideal" for a perfect solution, in that they may interfere with AN execution order. They will probably be removed at some stage after the collaboration is concluded.
MIDI Live and Audio Live nodes now included, these do what you might expect! They are concerned with live MIDI input from MIDI devices to drive animations and animation from a sound source external to Blender.
DAW Nodes are VERY experimental for now and are only included for collaboration and testing by others.