4 d. range (dynamic range), 6 hp tone ctrl (headphone tone control), 7 i/o assign (input/output assignment) – Yamaha HTR-5550 User Manual
Page 48: 7a cmpnt-v input for component video input jacks, 7b optical out for optical output jack, 7c optical in for optical input jacks, 7d coaxial in for coaxial input jack

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