The FOLCA pack for the OP-1 is a collection of 19 carefully designed Cuckoo patches, originally designed on the Korg Volca FM. One of my personal favourite game machine was the Sega Megadrive (Genesis in America), much because of the wonderful sharp FM sound engine. This sounds very similar :)
I've tried to replicate some sounds from games that I like, such as the legendary Toe Jam & Earl, as well as Phantasy Star 2. But most of the sounds are original sound design, with melodic content in mind.
This OP-1 pack are all samples. I've tried to make them musically useful, with nice loop points, and some subtle reverb here and there. Something that is fun to just play right off the bat. The OP-1 has a limit of 42 sample based patches at a time. So if you're getting error messages when transferring the sounds, you need to make sure there's no more than 42 sample patches on your OP-1.
The base price for this pack is $6. But if you want to drop me a few more coins in my tip jar, please pay whatever you like.
YouTube demo of the sounds, click here, or up in the title window of this post.