25 lines
495 B
Common Lisp
25 lines
495 B
Common Lisp
;; velocity.lsp -- conversion routines for MIDI velocity
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;;
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;; Roger B. Dannenberg
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;; July, 2012
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(defun db-to-vel (x &optional float)
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(linear-to-vel (db-to-linear x) float))
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(defun linear-to-vel (x &optional float)
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(setf x (/ (- (sqrt (abs x)) 0.0239372) 0.00768553))
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(cond (float x)
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(t
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(setf x (round x))
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(max 1 (min 127 x)))))
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(defun vel-to-db (v)
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(linear-to-db (vel-to-linear v)))
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(defun vel-to-linear (v)
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(power (+ (* v 0.00768553) 0.0239372) 2))
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