--- ./gtk2_ardour/engine_dialog.cc.orig	2010-07-22 19:39:42.000000000 -0400
+++ ./gtk2_ardour/engine_dialog.cc	2010-07-22 19:45:46.000000000 -0400
@@ -400,6 +400,8 @@
 		cmd.push_back ("-R");
 		cmd.push_back ("-P");
 		cmd.push_back (to_string ((uint32_t) floor (priority_spinner.get_value()), std::dec));
+	} else {
+		cmd.push_back ("-r"); /* override jackd's default --realtime */
 	}
 
 	if (unlock_memory_button.get_active()) {