Index: gtk2_ardour/engine_dialog.cc
===================================================================
--- gtk2_ardour/engine_dialog.cc	(révision 2499)
+++ gtk2_ardour/engine_dialog.cc	(copie de travail)
@@ -363,6 +363,7 @@
 	bool using_coreaudio = false;
 	bool using_netjack = false;
 	bool using_ffado = false;
+	bool using_dummy = false;
 
 	/* first, path to jackd */
 
@@ -425,6 +426,9 @@
 	} else if (driver == X_("FFADO")) {
 		using_ffado = true;
 		cmd.push_back ("ffado");
+	} else if (driver == X_("Dummy")) {
+		using_dummy = true;
+		cmd.push_back ("dummy");
 	}
 
 	/* driver arguments */
@@ -448,9 +452,10 @@
 		} else if (str == _("Recording only")) {
 			cmd.push_back ("-C");
 		}
-
-		cmd.push_back ("-n");
-		cmd.push_back (to_string ((uint32_t) floor (periods_spinner.get_value()), std::dec));
+		if (!using_dummy) {
+			cmd.push_back ("-n");
+			cmd.push_back (to_string ((uint32_t) floor (periods_spinner.get_value()), std::dec));
+		}
 	}
 
 	cmd.push_back ("-r");