Fix minor typos (#720)

Co-authored-by: freddii <https://freddii@github.com>

plug-ins/label-sounds.ny

@@ -206,7 +206,7 @@ $control text (_ "Label text") string "" (_ "Sound ##1")
             (setf end-time (first (nth (1- i) snd-list)))
             ;don't overlap next sound
             (setf label-start (min end-time (+ start-time pre-offset)))
-            ;dont't overlap previous sound
+            ;don't overlap previous sound
             (setf label-end (max start-time (- end-time post-offset)))
             ;ensure end is not before start
             (when (< (- label-end label-start) 0)

plug-ins/spectral-delete.ny

@@ -125,7 +125,7 @@ $copyright (_ "Released under terms of the GNU General Public License version 2"
       (setf f1 (/ f1 *sound-srate*)))
     ;(format t "Low: ~a    High: ~a" (if f0 (* f0 *sound-srate*) nil) (if f1 (* f1 *sound-srate*) nil))
     (if (not (or f0 f1))
-        ""  ;may occur if multiple tracks with diferent sample rates
+        ""  ;may occur if multiple tracks with different sample rates
         (sim
           (mult env
               (if f0 (dofilter f0 lp-width 0) 0))

plug-ins/vocalrediso.ny

@@ -195,7 +195,7 @@ $control high-transition (_ "High Cut for Vocals (Hz)") real "" 9000 1 24000
 
 
 ;; Make a weighted center (mono)
-;; that can be substracted from L&R
+;; that can be subtracted from L&R
 (defun steer (side obj &aux (mid (send obj :next)))
   (cond
     ((and mid side)