Difference in numbers ( hex / dec) within "midi routing"

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Is this done on purpose? Makes no sense to me?

MIDI Channels are decimal, Instrument numbers are hexadecimal;
they seem to have no direct relationship.

The Instrument number can be what you choose.
The MIDI channel should match the midi device’s configured channel.

The MIDI channel should match the midi device’s configured channel

ermm… no? This has nothing to do with “midi devices”.