diff --git a/extensions/fablabchemnitz_fret_ruler.inx b/extensions/fablabchemnitz_fret_ruler.inx
index db94498d..7be3c920 100644
--- a/extensions/fablabchemnitz_fret_ruler.inx
+++ b/extensions/fablabchemnitz_fret_ruler.inx
@@ -1,105 +1,96 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <inkscape-extension xmlns="http://www.inkscape.org/namespace/inkscape/extension">
-    <name>Fret Ruler</name>
-    <id>fablabchemnitz.de.fret_ruler</id>
-    <param name="active-tab" type="notebook">
-        <page name="ruler" gui-text="Ruler ">
-            <param name="descr" type="description">Draw a Ruler for stringed instrument Necks.</param>
+   <name>Fret Ruler</name>
+   <id>fablabchemnitz.de.fret_ruler</id>
+   <param name="active-tab" type="notebook">
+      <page name="ruler" gui-text="Ruler ">
+         <vbox>
+            <label>Draw a Ruler for stringed instrument Necks.</label>
             <param name="draw_style" gui-text="Draw Style" type="optiongroup" appearance="combo">
-                <option value="ruler">Ruler</option>
-                <option value="template">Router Template</option>
-                <option value="neck">Neck</option>
+               <option value="ruler">Ruler</option>
+               <option value="template">Router Template</option>
+               <option value="neck">Neck</option>
             </param>
             <param name="method" gui-text="Calculation Method" type="optiongroup" appearance="combo">
-                <option value="12root2">12th Root of 2</option>
-                <option value="18">18</option>
-                <option value="17.817">17.817</option>
-                <option value="17.835">17.835</option>
-                <option value="scala">Scala</option>
-                <option value="Nroot2">Nth Root of 2</option>
+               <option value="12root2">12th Root of 2</option>
+               <option value="18">18</option>
+               <option value="17.817">17.817</option>
+               <option value="17.835">17.835</option>
+               <option value="scala">Scala</option>
+               <option value="Nroot2">Nth Root of 2</option>
             </param>
-            <param name="descr" type="description">Next two, only if method selected.</param>
-            <param name="nth" type="int" min="2" max="500" gui-text="(Method=Nth Root of 2) -  N=(Notes in Scale):">0</param>
-            <param name="scala_filename" type="string" gui-text="(Method=Scala) Scala filename:">12tet</param>
-            <param name="descr" type="description">____</param>
-            <param name="units" gui-text="Units for following dimensions" type="optiongroup" appearance="combo">
-                <option value="in">in</option>
-                <option value="mm">mm</option>
-            </param>
-            <param name="length" type="float" min="1" max="1000.0" precision="2" gui-text="Scale Length in units (Ruler length)">25.5</param>
-            <param name="width" type="float" min="0.5" max="1000.0" precision="2" gui-text="Width (Nut) in units">1.35</param>
-            <param name="frets" type="int" min="2" max="500" gui-text="Number of frets to draw">18</param>
-            <param name="descr" type="description">____</param>
-            <param name="fanned" type="bool" gui-text="Fanned fret style (Treble and Bass scale lengths)">false</param>
+            <label>Next two, only if named method has been selected.</label>
+            <hbox>
+               <param name="nth" type="int" min="2" max="50" gui-text="(Method=Nth Root of 2): Notes in Scale:">0</param>
+               <param name="scala_filename" type="string" gui-text="(Method=Scala): Scala filename:">12tet</param>
+            </hbox>
+         </vbox>
+         <label>Dimensions:</label>
+         <param name="units" gui-text="Units for following dimensions" type="optiongroup" appearance="combo">
+            <option value="in">in</option>
+            <option value="mm">mm</option>
+         </param>
+         <param name="length" type="float" min="1" max="1000.0" precision="2" gui-text="Scale Length in units (Ruler length)">25.5</param>
+         <param name="width" type="float" min="0.5" max="1000.0" precision="2" gui-text="Width (Nut) in units">1.35</param>
+         <param name="frets" type="int" min="2" max="500" gui-text="Number of frets to draw">18</param>
+         <label>Fanned:</label>
+         <param name="fanned" type="boolean" gui-text="Fanned fret style (Treble and Bass scale lengths)">false</param>
+         <hbox>
             <param name="basslength" type="float" min="1" max="1000.0" precision="2" gui-text="Bass Scale Length">25.5</param>
-            <param name="perpendicular" type="int" min="0" max="500" gui-text="Fret which is perpendicular to neck">7</param>
-            <param name="descr" type="description">Styles:</param>
-            <param name="linewidth" type="float" min="0.01" max="2.0" precision="2" gui-text="Width of lines (mm)">0.1</param>
-            <param name="notch_width" type="float" min="0.0001" max="4.0" precision="4" gui-text="(Router template) Width of Fret notches">0.125</param>
-            <param name="annotate" type="bool" gui-text="Fret numbering">true</param>
-            <param name="centerline" type="bool" gui-text="Centerline">true</param>
-        </page>
-        <page name="neck" gui-text="Neck ">
-            <param name="descr" type="description">Extra parameters to draw the Neck.</param>
-            <param name="constant_width" type="bool" gui-text="Constant width (=Nut)">false</param>
-            <param name="width_bridge" type="float" min="0.5" max="1000.0" precision="2" gui-text="OR: Width (at Bridge) in units">2.0</param>
-            <param name="show_markers" type="bool" gui-text="Show Markers">false</param>
-            <param name="markers" type="string" gui-text="Marked frets:">3,5,7,10,12,12,15</param>
-            <param name="nutcomp" type="bool" gui-text="Include Nut Compensation">false</param>
-            <param name="nutcomp_value" gui-text="Preset values" type="optiongroup" appearance="combo">
-                <option value="0.012">0.012in (0.30mm)</option>
-                <option value="0.014">0.014in (0.36mm)</option>
-                <option value="manual">Manual</option>
-            </param>
-            <param name="nutcomp_manual" type="string" gui-text="Manual nut compensation distance">0.014</param>
-        </page>
-        <page name="curvature" gui-text="Curvature ">
-            <param name="descr" type="description">Additional Neck Curvature Ruler</param>
-            <param name="show_curves" type="bool" gui-text="Show neck curvature ruler">true</param>
-            <param name="neck_radius" type="float" min="4" max="100.0" precision="2" gui-text="Radius of Neck curvature in units">9.75</param>
-            <param name="arc_length" type="float" min="1" max="100.0" precision="2" gui-text="Arc Length (units)">5</param>
-            <param name="block_mode" type="bool" gui-text="Draw as a block (vs finger)">true</param>
-            <param name="arc_height" type="float" min="0.1" max="50.0" precision="2" gui-text="Height of the Arc(units)">0.5</param>
-            <param name="string_spacing" type="float" min="0.1" max="20.0" precision="2" gui-text="String separation(for finger style) (units)">0.3</param>
-            <param name="descr" type="description">Print or Metal Lasercut as a thin radius guide,
+            <param name="perpendicular" type="int" min="0" max="500" gui-text="Perpendicular Fret">7</param>
+         </hbox>
+         <label>Styles:</label>
+         <param name="linewidth" type="float" min="0.01" max="2.0" precision="2" gui-text="Width of lines (mm)">0.1</param>
+         <param name="notch_width" type="float" min="0.0001" max="4.0" precision="4" gui-text="(Router template) Width of Fret notches">0.125</param>
+         <hbox>
+            <param name="annotate" type="boolean" gui-text="Fret numbering">true</param>
+            <param name="centerline" type="boolean" gui-text="Centerline">true</param>
+         </hbox>
+      </page>
+      <page name="neck" gui-text="Neck ">
+         <param name="descr" type="description">Extra parameters to draw the Neck.</param>
+         <param name="constant_width" type="boolean" gui-text="Constant width (=Nut)">false</param>
+         <param name="width_bridge" type="float" min="0.5" max="1000.0" precision="2" gui-text="OR: Width (at Bridge) in units">2.0</param>
+         <param name="show_markers" type="boolean" gui-text="Show Markers">false</param>
+         <param name="markers" type="string" gui-text="Marked frets:">3,5,7,10,12,12,15</param>
+         <param name="nutcomp" type="boolean" gui-text="Include Nut Compensation">false</param>
+         <param name="nutcomp_value" gui-text="Preset values" type="optiongroup" appearance="combo">
+            <option value="0.012">0.012in (0.30mm)</option>
+            <option value="0.014">0.014in (0.36mm)</option>
+            <option value="manual">Manual</option>
+         </param>
+         <param name="nutcomp_manual" type="string" gui-text="Manual nut compensation distance">0.014</param>
+      </page>
+      <page name="curvature" gui-text="Curvature ">
+         <param name="descr" type="description">Additional Neck Curvature Ruler</param>
+         <param name="show_curves" type="boolean" gui-text="Show neck curvature ruler">true</param>
+         <param name="neck_radius" type="float" min="4" max="100.0" precision="2" gui-text="Radius of Neck curvature in units">9.75</param>
+         <param name="arc_length" type="float" min="1" max="100.0" precision="2" gui-text="Arc Length (units)">5</param>
+         <param name="block_mode" type="boolean" gui-text="Draw as a block (vs finger)">true</param>
+         <param name="arc_height" type="float" min="0.1" max="50.0" precision="2" gui-text="Height of the Arc(units)">0.5</param>
+         <param name="string_spacing" type="float" min="0.1" max="20.0" precision="2" gui-text="String separation(for finger style) (units)">0.3</param>
+         <param name="descr" type="description" xml:space="preserve">Print or Metal Lasercut as a thin radius guide,
 or export to Openscad to make a longer 3d printed neck support or sanding block.
-
 Sizes:
-Ukulele - typically flat
-Guitars - 7.25 to 20inches (Classical is flat)
-Violins,Cellos - typically have compound radii to accomodate natural finger reach.
-
-Typical ruler set: 7.25, 9.5, 10, 12, 14, 15, 16, 20
-- Fender strat vintage - 7.25 (184.1mm)
-- Fender strat modern - 9.5 (241mm)
-- Gibson - 12 (305mm)
-- Danelectro - 14 (355mm)
-- Ibanez RG,S - 15.75-17 (400-430mm)
-- Ibanez Artcore, SZ - 12 (305mm)
-- PRS - 10 (254mm), 11.5 (292mm)
-- Jackson - 16 (406mm)
-- Typical electric - 9.5-10 (241-254mm)
-- Typical electric + FloydRose Bridge - 10 (254mm)
-- Martin Acoustic - 16 (406.4mm)
-- Violin - 42mm
+See Help Curve Tab
 			</param>
-        </page>
-        <page name="filters" gui-text="Scala ">
-            <param name="descr" type="description">This is a helper tab. It does not contribute to drawing the Fret Ruler/Neck.</param>
-            <param name="descr" type="description">It shows you all the scala files matching the search filters below. Enter the filename on the first tab.</param>
-            <param name="descr" type="description">This search only works if you can see this tab.</param>
-            <param name="descr" type="description">There may be &gt;4000 scala files. So choose wisely.</param>
-            <param name="filter_tones" type="bool" gui-text="Filter by number of tones in a scale.">true</param>
-            <param name="scale" type="int" min="2" max="1000" gui-text="Notes in a scale:">12</param>
-            <param name="filter_label" type="bool" gui-text="Filter by word in title / internal description.">true</param>
-            <param name="keywords" type="string" gui-text="Key word:">diatonic</param>
-        </page>
-        <page name="help" gui-text="Help ">
-            <param name="descr" type="description">USE:
+      </page>
+      <page name="filters" gui-text="Scala ">
+         <param name="descr" type="description">This is a helper tab. It does not contribute to drawing the Fret Ruler/Neck.</param>
+         <param name="descr" type="description">It shows you all the scala files matching the search filters below. Enter the filename on the first tab.</param>
+         <param name="descr" type="description">This search only works if you can see this tab.</param>
+         <param name="descr" type="description">There may be &gt;4000 scala files. So choose wisely.</param>
+         <param name="filter_tones" type="boolean" gui-text="Filter by number of tones in a scale.">true</param>
+         <param name="scale" type="int" min="2" max="1000" gui-text="Notes in a scale:">12</param>
+         <param name="filter_label" type="boolean" gui-text="Filter by word in title / internal description.">true</param>
+         <param name="keywords" type="string" gui-text="Key word:">diatonic</param>
+      </page>
+      <page name="help" gui-text="Help ">
+         <param name="descr" type="description" xml:space="preserve">USE:
 Export as PDF, print in Poster mode for full scale drawing.
 Glue onto fretboard and cut - or lasercut Router template.
 			</param>
-            <param name="descr" type="description">Methods:
+         <param name="descr" type="description" xml:space="preserve">Methods:
 12th Root of 2 - 'preferred' method for even temperment scales.
 Note: 12th Root of 2 and the 17.817 give identical results.
 17.835 is similar (unrounded calculation) to 17.817, and has max 0.2mm difference in a 24 inch scale.
@@ -121,12 +112,11 @@ Neck Curvature Ruler:
 Necks can have one radius (e.g. 7.25) at the nut and a wider radius (e.g. 12) at the body.
 This called a Conical radius (incorrectly a compound radius). It enables easier single string control at the Nut and chords nearer the body.
 			</param>
-        </page>
-        <page name="help2" gui-text="Help2 ">
-            <param name="descr" type="description">Fretboard lengths:
+      </page>
+      <page name="help2" gui-text="Help Lengths">
+         <param name="descr" type="description" xml:space="preserve">Fretboard lengths:
 Guitar scale lengths are usually between 24" and 26".
 Bass scale lengths generally stay between 30" to 36".
-
 Common scale lengths:
 Banjo - 26_3/16 (665.2mm)
 Mandolin - 13_7/8 (335mm)
@@ -145,16 +135,36 @@ Paul Reed Smith - 25 (635mm)
 Hofner Beatle Bass - 30 (762mm)
 Martin - 24.9, 25.34 (632.5, 643.64mm)
 PRS - 25 (635mm)
-
 Baritone - 27.67 (702.82mm)
 Short scale bass - 30 (762mm)
-
 Classical guitar 25.6, 26 (650, 660mm)
 Baritone guitar 28.5, 30.2 (724, 767mm)
 			</param>
-        </page>
-    </param>
-    <effect needs-live-preview="true">
+      </page>
+      <page name="help3" gui-text="Help Curves">
+         <param name="descr" type="description" xml:space="preserve">Sizes:
+Ukulele - typically flat
+Guitars - 7.25 to 20inches (Classical is flat)
+Violins,Cellos - typically have compound radii to accomodate natural finger reach.
+
+Typical ruler set: 7.25, 9.5, 10, 12, 14, 15, 16, 20
+
+- Fender strat vintage - 7.25 (184.1mm)
+- Fender strat modern - 9.5 (241mm)
+- Gibson - 12 (305mm)
+- Danelectro - 14 (355mm)
+- Ibanez RG,S - 15.75-17 (400-430mm)
+- Ibanez Artcore, SZ - 12 (305mm)
+- PRS - 10 (254mm), 11.5 (292mm)
+- Jackson - 16 (406mm)
+- Typical electric - 9.5-10 (241-254mm)
+- Typical electric + FloydRose Bridge - 10 (254mm)
+- Martin Acoustic - 16 (406.4mm)
+- Violin - 42mm
+			</param>
+      </page>
+   </param>
+   <effect needs-live-preview="true">
         <object-type>path</object-type>
         <effects-menu>
            <submenu name="FabLab Chemnitz">