Looking for circuit diagram info. for this quite old Dolby stereo sound processor

Hi! Can anyone help me locate a circuit diagram (or even just an extract) for this pretty old unit (part of a complete audio system) I want to try to get into it and modify, so as to feed in separate 5.1 inputs from a DVD player; so I just need to know at what point in the circuit and physically it would be easiest to break into it --- you know the sort of info I'll need! Thanks, in advance, for any help you may be able to give me. 'Dusty' :-)

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