From the [Matias manual](https://matias.ca/halfkeyboard/resources/downloads/HK101_RevisedManual.pdf): <img width="968" alt="image" src="https://user-images.githubusercontent.com/464574/129990353-ffe9f6c7-76ca-4dba-bd77-2eec716594cb.png"> [HK101_RevisedManual.pdf](https://github.com/ZevEisenberg/HalfKeyboard/files/7010967/HK101_RevisedManual.pdf)
From the Matias manual:
HK101_RevisedManual.pdf