TheOrganist: Just found that the unit doesn't switch channel automatically UNLESS it is recording! Just in the timed programme area, you can say "start time only" but set the recorder to off. Doesn't work.
It looks like "Recorder Set" and "Timer Control" variables are mismatched in "Timer settings" in the same way as the time intervals. For example, if in the later timer the recorder set will be off, the previous setup number will not start recording.