diff --git a/4PointCutting/4Pcut_execute.lua b/4PointCutting/4Pcut_execute.lua
index f4b3c1d..e596635 100644
--- a/4PointCutting/4Pcut_execute.lua
+++ b/4PointCutting/4Pcut_execute.lua
@@ -5,6 +5,7 @@
 -- Git: https://files.eleton-audio.de/gitea/Ludwig/Reaper-Scripts.git
 -- License: GPL v3.0
 -- Requires: Reaper 5 or 6
+-- Requires: SWS extensions, if not present no crossfades are created. http://standingwaterstudios.com
 -- Requires: This script goes with several other scripts that work closely together.
 
 local stored_cursorPos = 0
@@ -23,7 +24,7 @@ local mark_dstin_id = -1
 local mark_dstout_pos = -1
 local mark_dstout_id = -1
 local edit_mode = 0 
-local waitcount = 0
+local sws_present = false
 -- edit modes: 0=not enough markers set; 1=src-in, src-out, dst-in; 2=src-in, src-out, dst-out;
 --          3=src-in, dst-in, dst-out; 4=src-out, dst-in, dst-out; 5=all four markers set;
 
@@ -75,6 +76,8 @@ function select_dst_track_only()
 end
 
 -- START HERE vvvvvvvvvvvvvvvvvvvvvvvvvv
+-- check for SWS extensions
+if reaper.NamedCommandLookup('_SWS_ABOUT') > 0 then sws_present = true end
 -- run through all markers and get position of the 4 points
 local nof_markers = 0
 local nof_regions = 0
@@ -172,6 +175,12 @@ reaper.MoveEditCursor(mark_dstin_pos - reaper.GetCursorPosition(), false)
 select_dst_track_only()
 reaper.Main_OnCommand(40058, 0) -- paste item 
 --reaper.Main_OnCommand( reaper.NamedCommandLookup('_SWS_AWPASTE'), 0 ) -- SWS Paste
+-- Crossfade (only with SWS extensions, "fill gaps")
+reaper.Main_OnCommand( 40290, 0 ) -- set time selection to selected items 
+reaper.Main_OnCommand( 40320, 0 ) -- nudge left edge of time selection left
+reaper.Main_OnCommand( 40323, 0 ) -- nudge right edge of time selection right
+reaper.Main_OnCommand( 40718, 0 ) -- select items on selected tracks and in time selection
+reaper.Main_OnCommand( reaper.NamedCommandLookup('_SWS_AWFILLGAPSQUICKXFADE'), 0 )  --  fill gaps between selected items and crossfade
 -- Move dstin marker according to edit mode
 if edit_mode == 1 then 
     reaper.SetProjectMarker(mark_dstin_id, false, mark_dstin_pos + (mark_srcout_pos - mark_srcin_pos), 0, 'DST-IN_4Pcut')