Reduce inter-thread buffering a bit

This isn't needed so much now that the output buffers more.

Should reduce the problems of #370

Signed-off-by: Christopher Snowhill <kode54@gmail.com>

Audio/Chain/Node.m

@@ -22,7 +22,7 @@
 - (id)initWithController:(id)c previous:(id)p {
 	self = [super init];
 	if(self) {
-		buffer = [[ChunkList alloc] initWithMaximumDuration:3.0];
+		buffer = [[ChunkList alloc] initWithMaximumDuration:1.0];
 		semaphore = [[Semaphore alloc] init];
 
 		accessLock = [[NSLock alloc] init];