Welcome to the forum.
Sorry to hear about your grandfather. You are doing what a lot of us hope our children will….appreciating our passions.
First, here is a link with a lot of info for you: There are scans of the service manuals, the operations manual, etc. Read the manual and learn about the Basic components of the synthesizer: Oscillators, Filters, Envelope Generators (Contour Generators), and the Amplifiers. Then there is the modulation section.
Learn what each function is, what it does, and how to use it.
http://www.fantasyjackpalance.com/fjp/s ... oog.html#2
Learning about music is important for any instrument if you want to have a good grasp of how to PLAY your mini, but the quickest way to learn how to OPERATE your minimoog is by synthesizing instruments, and there isn’t any better place to star than programming basses. It is simply too gratifying on a minimoog. It will help you learn the Amount of Contour knob, the Filter attack, etc. Luckily the minimoog is simply laid out and it doesn’t take long to get acquainted with the beast. Just keep in mind that it will do SO MUCH MORE than that.
I second the sound chart recommendations.
At some point you will want to find someone who knows how to maintain the Moog. It will require calibration and cleaning at regular intervals. Even better if you can learn how to do that yourself.
Whatever you do, you have a fantastic instrument, your grandfather very likely acquired it new, and he would be proud to see you learn synthesis to know that you are doing the best thing anyone possibly can with it: turning it on regularly and playing it.
Do what makes you happy, and feel a lasting bond with your grandfather as you explore something that he obviously loved very much.
I kind of have the same thing, my grandfather was a Radioman in WWII. Although I didn’t get into Amateur Radio until a few years after he died, I know that he would have loved to have helped me learn all of the theory. In a way I can kind of appreciate him even more through the hobby.
Do you have any idea as to what year it was made?
Good luck to you and welcome to the forum and to the Minimoog.
Eric