Hi Anthony,
I spent some time this morning trying to achieve a third solution to your problem, using the facilities within the KN7000 Composer editor, but have not come up with anything. As I said previously, I was sure that I had achieved this effect, so I looked back through some of my sequences and found a recording where I had Fill-In 1 and Fill-In 2 apparently sounding as a single item. However, on closer examination, I found that they were not actually a 'single' Fill-In, but separate events in the sequence
I changed the length of Fill-In 1 and Fill-In 2, to two bars and then copied the first bar of Fill-In 2 to the second bar of Fill-In 2. Then I deleted the content of bar 1 of Fill-In 2, leaving the first bar blank. So, Fill-In 1 now consisted of the first bar with the original data, followed by a blank bar and Fill-In 2 had it's first bar blank and second bar with it's original data. However, when Fill-In 2 is copied over to Fill-In 1, Fill_in 2 just completely overwrites all the data in Fill-In 1. What is needed is a 'Merge' facility, rather than a 'Copy' facility.
Unfortunately, it does not seem to be possible to copy over individual bars of a Composer part to another part within the same Composer pattern - it's only possible to copy over the entire group of bars, for any single component, within the Composer pattern. So whilst it is possible to say copy (ie overwrite) Fill-In 1 to Fill-In2, or even copy a Fill-In, or Intro/Ending to a Pattern, I can't see a way to copy individual bars from one component to another.
Your two methods certainly work OK and would appear to be the only solutions - unless of course someone else knows a different approach ?? (Are you listening Alec??)
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Willum