I've started an effort to replace the somewhat dubious Dirt-Samples with a clean set of samples, with proper (permissive) licensing info and so on. It'd be great to build this into a worthy replacement as a set of 'default' samples. We can transfer some classics from Dirt- to Clean- where the license info is clear.
There's a repository here with instructions for how to contribute. Please shout with questions/thoughts!
These aren't integrated with SuperDirt yet but the idea is that they'll be easily installed through SuperCollider quarks system and then automatically available to SuperDirt.