Others can make more informed recommendations; to the best of my knowledge it's going to depend on your keyboard and what firmware it runs. (There are some os-level heatmappers you can use, too.) When I used a Voyager I used the Heatmap feature in ZSA's keymapp app. When I was using a corne I used Via/Vial to do it. I finally found my way to the glove and used the data from those.
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Others can make more informed recommendations; to the best of my knowledge it's going to depend on your keyboard and what firmware it runs. (There are some os-level heatmappers you can use, too.) When I used a Voyager I used the Heatmap feature in ZSA's keymapp app. When I was using a corne I used Via/Vial to do it. I finally found my way to the glove and used the data from those.