3 i/o assign, 4 input mode (initial input mode), 5 dolby d. set (dolby digital set) – Yamaha HTR-5440RDS User Manual
Page 40: 38 3 i/o assign, 3a (1) and (2) (for the optical input jacks), 3b (3) (for the coaxial input jack), Lfe level, D-range (dynamic range)
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