BooTweak Designs has released The Machine, a collection of 233 BooTweak kits from 214 vintage drum machines and keyboards.
All kits are now finished. They are all drum kits with the exception of 6 or 7 kits.
The 5 Oberheim Matrix 1000 kits have single synth samples mapped across the keyboard for each of the 8 BooTweak groups, so you can solo the groups you want to layer in a patch. All of the tonal sounds have been tuned together for instant blending pleasure.
The Machine BooTweak kits are available as a free download. BooTweak, a donationware Kontakt script template for working with samples (especially drums) is included with the kits.
More information: BooTweak