Update README for knob info

README.md

@@ -10,6 +10,7 @@ DrMr is an LV2 sampler plugin.  It's main reason to exist is to give a way for l
 - LV2 controls for gain on first 32 samples of kit (see note 2 below)
 - LV2 controls for pan on first 32 samples of kit (see note 2 below)
 - GTK ui that can select a kit and control gain/pan on each sample
+- Custom knob widget for GTK ui based on phatknob that is both functional and awesome looking. (see wiki for screenshot)
 
 Hopefully coming soon:
 
@@ -30,7 +31,7 @@ DrMr is built with [CMake](http://www.cmake.org).
 To build it simply do (from this dir):
     mkdir build
     cd build
-    cmake ..
+    cmake ..    (or "cmake -DUSE_NKNOB=OFF .." if you want old style sliders)
 
 Then do:
     make
@@ -38,6 +39,8 @@ Then do:
 
 to install.  There are some customizable variables for cmake.  To see them do "cmake -L".  The important ones are:
 
+USE_NKNOB - Use custom knob widget for controls instead of the default gtk sliders.  This defaults to ON.  Try turning it off if you are experiencing problems, or just prefer the sliders.
+
 LV2_INSTALL_DIR - The directory to install the DrMr plugin to. To install to your home directory, use "~/.lv2" and clear the CMAKE_INSTALL_PREFIX. This defaults to "lib/lv2" (this is relative to CMAKE_INSTALL_PREFIX, which is usually /usr/local)
 
 You can also use "ccmake .." or "cmake-gui .." for a more interactive configuration process.