Just a friendly observation…
The suptuplet divisional math is incorrect on you web promotion:
A more correct version would be:
A more correct version would be:
Well… You might be right on the fact the septuplet could show something like 7:6, because there are 7 16ths in the time of 6 16ths in Dorico’s example. Look carefully though : both first and last 16ths of the beat are NOT in the septuplet 