The M1 VST comes with the factory produced sounds from all released cards. I didn't have any empty ones.
Check or hunt the Korg forum for the additional M1 zip file of sounds that's out there. I got it last year sometime.
The zip file had TONS of sound banks that used to be for purchase but the companies went out of business or no longer sells the sounds - this is copyrighted sounds which if I remember right the collector got permission from all the vendors to include in the bundle zip file. TOTALLY worth the hunt as there are latterly hundreds of sounds that are useful.
for $50 I was so stoked to get so many sounds for a great plugin.