Added notch.ny by Bill and Steve as per http://wiki.audacityteam.org/wiki/Default_EQCurves#Proposed_and_under_discussion

plug-ins/notch.ny

@@ -0,0 +1,24 @@
+;nyquist plug-in
+;version 1
+;type process
+;categories "http://lv2plug.in/ns/lv2core/#FilterPlugin"
+;name "Notch Filter..."
+;action "Performing Notch Filter..."
+;info "By Steve Daulton and Bill Wharrie. Released under GPL v2."
+
+;control freq "Frequency" real "Hz" 60 0 10000
+;control q "Q (higher value reduces width)" real "" 1 0.1 20
+
+;; notch.ny by Steve Daulton and Bill Wharrie, September 2010.
+;; Released under terms of the GNU General Public License version 2:
+;; http://www.gnu.org/licenses/old-licenses/gpl-2.0.html .
+
+;; (multichan-expand) provides legacy support for old versions of Audacity 
+;; in which the (notch2) function only supports mono tracks.
+
+(cond
+  ((> freq (/ *sound-srate* 2.0))(format nil "Error:\nFrequency too high for track sample rate."))
+  ((< freq 0)(format nil "Error:\nNegative frequency is invalid."))
+  ((< q 0.01)(format nil "Error:\nWidth must be at least 0.01."))
+  ((= freq 0) (format nil "Nothing to be done."))
+  (T (multichan-expand #'notch2 s freq q)))