Index: gtk2_ardour/canvas-waveview.h
===================================================================
--- gtk2_ardour/canvas-waveview.h	(Revision 2139)
+++ gtk2_ardour/canvas-waveview.h	(Arbeitskopie)
@@ -77,7 +77,7 @@
 	void (*peak_function)(void*,gulong,gulong,gulong,gpointer,guint32,double);
     gulong (*length_function)(void *);
     gulong (*sourcefile_length_function)(void*,double);
-    void (*gain_curve_function)(void *arg, double start, double end, float* vector, guint32 veclen);
+    void (*gain_curve_function)(void *arg, double start, double end, float* vector, guint64 veclen);
     void *gain_src;
 
     /** x-axis: samples per canvas unit. */