/usr/share/audacity/nyquist/velocity.lsp is in audacity-data 2.2.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | ;; velocity.lsp -- conversion routines for MIDI velocity
;;
;; Roger B. Dannenberg
;; July, 2012
(defun db-to-vel (x &optional float)
(linear-to-vel (db-to-linear x) float))
(defun linear-to-vel (x &optional float)
(setf x (/ (- (sqrt (abs x)) 0.0239372) 0.00768553))
(cond (float x)
(t
(setf x (round x))
(max 1 (min 127 x)))))
(defun vel-to-db (v)
(linear-to-db (vel-to-linear v)))
(defun vel-to-linear (v)
(power (+ (* v 0.00768553) 0.0239372) 2))
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