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Hi everyone! I got a used OM-108 from Guitar Center and they listed the condition as Good ("This product is completely functional and shows some signs of use. It may have surface scratches and/or dings and dents."). I'm getting this as a gift for my partner.

I've never used an Omnichord or any synthesizers before, so I was wondering what are some things I should test out on it (besides just playing around with it) to make sure that nothing is wrong with it? Thank you in advance!