diff -ru /Volumes/Document1/Developpement/ProjectsCVS/ArdourCVS/ardour-0.9beta30-old/libs/ardour/ardour/mix.h /Volumes/Document1/Developpement/ProjectsCVS/ArdourCVS/ardour-0.9beta30/libs/ardour/ardour/mix.h
--- /Volumes/Document1/Developpement/ProjectsCVS/ArdourCVS/ardour-0.9beta30-old/libs/ardour/ardour/mix.h	2005-09-08 21:40:55.000000000 +0200
+++ /Volumes/Document1/Developpement/ProjectsCVS/ArdourCVS/ardour-0.9beta30/libs/ardour/ardour/mix.h	2005-09-19 13:24:51.000000000 +0200
@@ -49,6 +49,18 @@
 
 #endif
 
+#if defined (__APPLE__)
+
+float veclib_compute_peak		(ARDOUR::Sample *buf, jack_nframes_t nsamples, float current);
+
+void  veclib_apply_gain_to_buffer	(ARDOUR::Sample *buf, jack_nframes_t nframes, float gain);
+
+void  veclib_mix_buffers_with_gain	(ARDOUR::Sample *dst, ARDOUR::Sample *src, jack_nframes_t nframes, float gain);
+
+void  veclib_mix_buffers_no_gain	(ARDOUR::Sample *dst, ARDOUR::Sample *src, jack_nframes_t nframes);
+
+#endif
+
 /* non-optimized functions */
 
 float compute_peak			(ARDOUR::Sample *buf, jack_nframes_t nsamples, float current);
diff -ru /Volumes/Document1/Developpement/ProjectsCVS/ArdourCVS/ardour-0.9beta30-old/libs/ardour/globals.cc /Volumes/Document1/Developpement/ProjectsCVS/ArdourCVS/ardour-0.9beta30/libs/ardour/globals.cc
--- /Volumes/Document1/Developpement/ProjectsCVS/ArdourCVS/ardour-0.9beta30-old/libs/ardour/globals.cc	2005-09-08 21:40:55.000000000 +0200
+++ /Volumes/Document1/Developpement/ProjectsCVS/ArdourCVS/ardour-0.9beta30/libs/ardour/globals.cc	2005-09-19 13:06:00.000000000 +0200
@@ -49,6 +49,10 @@
 
 #include <ardour/mix.h>
 
+#if defined (__APPLE__)
+	#include <Carbon/Carbon.h> // For Gestalt
+#endif
+	
 #include "i18n.h"
 
 ARDOUR::Configuration* ARDOUR::Config = 0;
@@ -217,13 +221,27 @@
 
 		}
 
-#else
-		Session::compute_peak 		= compute_peak;
-		Session::apply_gain_to_buffer 	= apply_gain_to_buffer;
-		Session::mix_buffers_with_gain 	= mix_buffers_with_gain;
-		Session::mix_buffers_no_gain 	= mix_buffers_no_gain;
-
-		info << "No H/W specific optimizations in use" << endmsg;
+#else if defined (__APPLE__)
+		long sysVersion = 0;
+        if (noErr != Gestalt(gestaltSystemVersion, &sysVersion))
+            sysVersion = 0;
+			
+		if (sysVersion >= 0x00001040) { // Tiger at least
+			Session::compute_peak 		= veclib_compute_peak;
+			Session::apply_gain_to_buffer 	= veclib_apply_gain_to_buffer;
+			Session::mix_buffers_with_gain 	= veclib_mix_buffers_with_gain;
+			Session::mix_buffers_no_gain 	= veclib_mix_buffers_no_gain;
+			
+			info << "Apple VecLib H/W specific optimizations in use" << endmsg;
+		} else {
+  			Session::compute_peak 		= compute_peak;
+			Session::apply_gain_to_buffer 	= apply_gain_to_buffer;
+			Session::mix_buffers_with_gain 	= mix_buffers_with_gain;
+			Session::mix_buffers_no_gain 	= mix_buffers_no_gain;
+			
+			info << "No H/W specific optimizations in use" << endmsg;
+		}
+		
 #endif
 	} else {
 
diff -ru /Volumes/Document1/Developpement/ProjectsCVS/ArdourCVS/ardour-0.9beta30-old/libs/ardour/mix.cc /Volumes/Document1/Developpement/ProjectsCVS/ArdourCVS/ardour-0.9beta30/libs/ardour/mix.cc
--- /Volumes/Document1/Developpement/ProjectsCVS/ArdourCVS/ardour-0.9beta30-old/libs/ardour/mix.cc	2005-09-07 22:19:26.000000000 +0200
+++ /Volumes/Document1/Developpement/ProjectsCVS/ArdourCVS/ardour-0.9beta30/libs/ardour/mix.cc	2005-09-19 13:37:13.000000000 +0200
@@ -114,4 +114,35 @@
 	}
 }
 		
+#if defined (__APPLE__)
+#include <Accelerate/Accelerate.h>
+
+float
+veclib_compute_peak (ARDOUR::Sample *buf, jack_nframes_t nsamples, float current) 
+{
+	vDSP_maxv(buf, 1, &current, nsamples);
+	return current;
+}	
+
+void
+veclib_apply_gain_to_buffer (ARDOUR::Sample *buf, jack_nframes_t nframes, float gain)
+{		
+	vDSP_vsmul(buf, 1, &gain, buf, 1, nframes);
+}
+
+void
+veclib_mix_buffers_with_gain (ARDOUR::Sample *dst, ARDOUR::Sample *src, jack_nframes_t nframes, float gain)
+{
+	vDSP_vsma(src, 1, &gain, dst, 1, dst, 1, nframes);
+}
+
+void
+veclib_mix_buffers_no_gain (ARDOUR::Sample *dst, ARDOUR::Sample *src, jack_nframes_t nframes)
+{
+	// It seems that a vector mult only operation does not exist...
+	float gain = 1.0f;
+	vDSP_vsma(src, 1, &gain, dst, 1, dst, 1, nframes);
+}
+
+#endif