Update Nyquist generator plug-ins.

Preview enabled and use Preference setting.
Fixed a minor bugs in pluck.ny

plug-ins/pluck.ny

@@ -1,8 +1,9 @@
 ;nyquist plug-in
-;version 3
+;version 4
 ;type generate
 ;categories "http://lv2plug.in/ns/lv2core#GeneratorPlugin"
 ;name "Pluck..."
+;preview linear
 ;action "Generating pluck sound..."
 ;info "MIDI values for C notes: 36, 48, 60 [middle C], 72, 84, 96."
 ;author "David R.Sky"
@@ -11,7 +12,7 @@
 ;; Released under terms of the GNU General Public License version 2:
 ;; http://www.gnu.org/licenses/old-licenses/gpl-2.0.html .
 
-;control p "Pluck MIDI pitch" int "" 60 1 127
+;control pitch "Pluck MIDI pitch" int "" 60 1 120
 ;control fade "Fade-out type" choice "abrupt,gradual" 0
 ;control dur "Duration [seconds]" real "" 1 0.1 30
 
@@ -24,12 +25,24 @@
 ; maximum amplitude. As defined in Audacity, 'pluck' has 
 ; incorrect length duration and clipping at the start which gives
 ; rise to DC offset. Using 'snd-pluck' avoids the clipping and 
-; offset so we don't need the highpass8 filter that we used before.  
+; reduces offset so we don't need the highpass8 filter that we used before.
+; Updated to v4 by Steve Daulton May 2015
 
 
 ; set final-amp for abrupt or gradual fade
 (setf final-amp (if (= fade 1) 0.001 0.000001))
 
-(let* ((pluck-sound (snd-pluck *sound-srate* (step-to-hz p) 0 dur final-amp))
+;; Get length of preview
+(setq pdur
+  (if (get '*track* 'view) ;NIL if preview
+      dur
+      (get '*project* 'preview-duration)))
+
+(let* ((pluck-sound (snd-pluck *sound-srate* (step-to-hz pitch) 0 dur final-amp))
+       (pluck-sound (extract-abs 0 pdur pluck-sound)) ; shorten if necessary for preview.
        (max-peak (peak pluck-sound ny:all)))
-  (scale (/ 0.8 max-peak) pluck-sound))  
+  ;; snd-pluck has a random element and will occasionally produce
+  ;; zero amplitude at very high pitch settings. Avoid division by zero.
+  (if (> max-peak 0)
+      (scale (/ 0.8 max-peak) pluck-sound)
+      pluck-sound))