Smooth magic tool sound effect

CC-BY 4.0 by https://freesound.org/people/PercyFrench/

docs/AUTHORS.txt

@@ -184,7 +184,7 @@ June 17, 2002 - May 22, 2023
   Creative Commons Attribution 4.0 International (CC BY 4.0)
   by https://freesound.org/people/Ustym_Petrovych/
 
-  "Loops" & "Squiggles" Magic tools
+  "Loops", "Squiggles" & "Smooth" Magic tools
   by Bill Kendrick <bill@newbreedsoftware.com>
 
   "Loops" sound: "Percussion » Wobble Board"
@@ -197,6 +197,11 @@ June 17, 2002 - May 22, 2023
   Creative Commons 0 License (CC0)
   by https://freesound.org/people/Tomoyo%20Ichijouji/
 
+  "Smooth" sound: "clean guitar loop 3.mp3"
+  (https://freesound.org/people/PercyFrench/sounds/652600/)
+  Creative Commons Attribution 4.0 International (CC BY 4.0)
+  by https://freesound.org/people/PercyFrench/
+
   Mouse accessibility code and keyboard access
   Ankit Choudary <ankit.goaldecided@gmail.com>, as part of GSOC 2010,
   with integration and fixes by Pere Pujal i Carabantes <pere@fornol.no-ip.org>

docs/CHANGES.txt

@@ -23,7 +23,8 @@ https://tuxpaint.org/
     * WIP Smooth - Freehand paintbrush with a smoothing effect (Bezier curve)
       h/t Pere for the idea
       Bill Kendrick <bill@newbreedsoftware.com>
-      - WIP needs sfx
+      Sound effect CC-BY 4.0 by
+      https://freesound.org/people/PercyFrench/
       - WIP needs icon
 
     * WIP Squiggles - Draw squiggly shapes.