DC offset improvements

src/engine/dispatch.h

@@ -319,6 +319,18 @@ class DivDispatch {
      */
     virtual int getPortaFloor(int ch);
 
+    /**
+     * get the required amplification level of this dispatch's output.
+     * @return the amplification level.
+     */
+    virtual float getPostAmp();
+
+    /**
+     * check whether DC offset correction is required.
+     * @return truth.
+     */
+    virtual bool getDCOffRequired();
+
     /**
      * get a description of a dispatch-specific effect.
      * @param effect the effect.