In this Part 1 of 2 episode we look at Coordinate Systems. Specifically, Rob talks about SVG's viewport, the viewBox attribute, and both viewport space and user space coordinate systems.
The following blog post link has a section on the SVG viewport with examples for viewBox "displacement" and scaling units:
frankum-http://www.freesound.org/people/frankum/sounds/237581/ (adapted with vocals by Nico Dotti)
notembug-Epic Tribal Drums–http://www.freesound.org/people/notembug/sounds/264284/