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@lestrrat books.google.com/books?id=clLlBwAAQBAJ&pg=PA115&lpg=PA115&dq=trackpoint+acceleration+curve&source=bl&ots=qEgYuTzxqT&sig=fX-SHUHlgYr-VCEphqkzb3T3dG4&hl=en&sa=X&ved=0ahUKEwjTnLyn-4jXAhVT9WMKHefjBnoQ6AEIjgEwEg#v=onepage&q=trackpoint%20acceleration%20curve&f=false may have pointers to the ideal curve, but i’m on my phone and can’t tell.