Deleting Doubles by Changing Midi Channel in Logical Editor?

I’m having the age old problem of doubled notes in a recorded MIDI track (the “Delete Doubles” function has never worked properly in Cubase, as is well known). I’ve seen threads recommending checking and changing the MIDI channels of the doubled notes in the Logical Editor, but haven’t found anywhere a step-by-step explanation of how this is achieved. Could anyone enlighten me as to how this process would work? Thanks.