add missing outBus setter

This setter was removed erroneously. This patch also gets rid of
tracing the state of the server synth, we just try to release it, and
ignore errors.

classes/SuperDirt.sc

@@ -263,6 +263,11 @@ DirtOrbit {
 		this.value((latency: server.latency).putPairs(pairs));
 	}
 
+	outBus_ { |bus|
+		outBus = bus;
+		this.initNodeTree;
+	}
+
 	set { |...pairs|
 		pairs.pairsDo { |key, val|
 			defaultParentEvent.put(key, val)
@@ -374,14 +379,21 @@ GlobalDirtEffect {
 	}
 
 	play { |group, outBus, dryBus, effectBus|
-		if(synth.isPlaying) { synth.release };
+		this.release;
 		synth = Synth.after(group, name.asString ++ numChannels,
 			[\outBus, outBus, \dryBus, dryBus, \effectBus, effectBus] ++ state.asPairs
-		).register
+		)
 	}
 
-	release { |releaseTime|
-		synth.release(releaseTime)
+	release { |releaseTime = 0.2|
+		if(synth.notNil) {
+			// surpress error, because we don't keep track of server state
+			synth.server.sendBundle(nil,
+				['/error', -1],
+				[15, synth.nodeID, \gate, -1.0 - releaseTime],
+				['/error', -2]
+			);
+		};
 	}
 
 	set { |event|