Duality by Skunkworks: Videos 5 - 9!

The Skunkworks collective has not only supplied the fantastic pack of Duality puzzles, they have also sent us videos explaining the solutions! Here are puzzles 5 to 9, with explanations by the individual constructors. Many thanks from Simon & Mark to all the people involved:

Duality 5: Silent Hurricane by XeonRisq

Normal Sudoku rules apply.
Normal German Whisper rules apply.
Normal Entropic Line rules apply.
Lines are both German Whisper and Entropic.

Duality 5 video: https://youtu.be/LUDQxEWyW7E 

Duality 6: Moai by AnalyticalNinja

Normal sudoku rules apply.
The lines are palindromes and read the same from either direction.
The lines also have an equal sum N within each box they pass through. The sum can be different for each line.
The grey circles are odd.

Duality 6 video: https://youtu.be/gFrlgxuZeF8

Duality 7: Celtic Knot by Virtual

Normal Sudoku, Renban, and Between Line rules apply.
All lines are both renban and between lines.

Duality 7 video: https://youtu.be/6Iui7vz1WEc 

Duality 8: Dual Duel by Chilly

Normal sudoku rules apply.
The lines are simultaneously between lines and entropic lines. The digits on a line must lie strictly between the digits on its end points (between). Also, any set of three sequential cells along a line must contain a low digit (1-3), a medium digit (4-6), and a high digit (7-9) (entropic). Digits may repeat on a line, if allowed by other rules.
Clues outside the grid indicate the sum of the digits between the 1 and the 9 in the corresponding row or column.
Digits separated by a white dot must be consecutive. Not all white dots are given.

Duality 8 video: https://youtu.be/QfSioKGztqA 

Duality 9: Sumthing Yummy by Derektionary

Normal sudoku rules apply. Numbers outside the grid are sandwich clues AND x-sums clues. So, each number gives the sum of the digits strictly between the 1 and 9 in their respective row or column. Also, each number gives the sum of the first X digits in their row/column where X is the first digit that appears in the row/column from the direction of the clue.

Duality 9 video: https://youtu.be/k0fjbrYKHgE