As usual, full details, including links to the SLX and SLB pages concerned, can be found on the main Twitter page, and of course it is all free. I shall be posting the code at my earliest convenience.
Oh, and as an addendum - I have previously complained that Vimeo, my preferred Video Hosting Place, restricted uploads to a mere Thirty Megabytes per Week. They have recently changed their policies to permit Two Hundred and Fifty Megabytes per Week, and at no cost! I would thus heartily recommend them for all Machiniminamists without reservation; the resolution is the highest (400x300 rather than the usual 320x240), they allow direct access to one's source files if one wishes, and their interface is simply a joy to use.