Needing Roland Instruction Manual

I have a Roland Keyboard model # RD-250S AC117v-50\60HZ Serial# ZA85238 I am looking for a booklet with programing information for all they buttons on the keyboard. We purchased it used and they had no instruction manual. I know it will do a lot of things because of all the wording on the Keyboard I just don't know what to do to make it sound differently. Can you please help. I need the instruction manual. Thank you.

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