shuffle panner docs around, add balance control

_manual/17_mixing/02_panning/01_mono_panner.html

@@ -19,7 +19,7 @@ default setting is "center" (L=50%, R=50%).
   <a href="/mixing/panning/stereo_panner">stereo panner</a>
   interface. The difference is that the L/R labels in the lower half
   of the mono panner do not move because there is no "width" to
-  control
+  control.
 </p>
 </div>
 

_manual/17_mixing/02_panning/02_balance_control.html

@@ -0,0 +1,19 @@
+---
+layout: default
+title: Balance Control
+---                        
+
+<p>
+  For stereo tracks, you can now switch between the stereo panner and a
+  traditional <strong>balance control</strong> by right-clicking on the
+  panner widget.
+</p>
+<p>
+  When the balance is centered, the incoming signals will be unaffected.
+  Moving it to one side will linearly attenuate the signal of the opposite
+  side.
+</p>
+<div class="well">
+  While it is considerably less flexible than the stereo panner, it work
+  with arbitrary content without the danger of comb filter artefacts.
+</div>

_manual/17_mixing/02_panning/03_stereo_panner.html

@@ -5,8 +5,8 @@ title: Stereo Panner
 
 <p>
   The default stereo panner distributes two inputs to two outputs. Its
-  behaviour is controlled by two parameters, <em>width</em> and
-  <em>position</em>. The
+  behaviour is controlled by two parameters, <strong>width</strong> and
+  <strong>position</strong>. The
   default settings for the stereo panner are <em>width=100%</em> and  
   <em>position=center</em>. 
   This stereo panner assumes that the signals

_manual/17_mixing/02_panning/04_vbap_panner.html

@@ -88,7 +88,3 @@ panner in 4 in, 5 out mode"/>
   the panner direction. The width parameter controls the opening angle of
   the distribution sector.
 </p>
-
-
-
-