The index of this channel in the channel table (from 0 to MAX_NUM_CHANNELS-1) (Someday - not currently implemented) An index of -1 could be used to mean "set by name", in which case the target node will find and set the channel by settings.name.
TODO: REPLACE
Optional
settings?: ChannelSettingsThe new settings, or NULL to disable that channel
A pair of a channel number, mode and the (sharable) settings for that channel