This tutorial looks at building Snare drums based off the classic Roland 808 and 909. The tutorial builds off the previous x0x kick drum video found at vimeo.com/59949567
This video doesn't show as much building piece by piece, but instead is an overview of three different approaches to snare drum synthesis.
Finally, the TR-909 Ens shown in the tutorial uses a custom Gate Sync Triangle Oscillator built in Core. It is partly based off a fantastic tutorial by salamanderanagram found at http://www.nireaktor.com/reaktor-tutorials/oscillators-in-reaktor-core-part-ii/