Simple power on and volume and input selection work fine on RX-v640. Other functions do not work properly. In tuner mode, stations are selected using the green buttons at the bottom of the console in the currently active bank. A bank cannot be selected via the remote control. In another input mode, keys surrounded by black color give key selection effects. In the online manual you can find a list of buttons that can be used to control other devices such as the TV, but could not control the TV with the numbers provided.
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