slightly better buffer system

desktop/src/zero1hd/rhythmbullet/desktop/audio/visualizer/DesktopVisualizer.java

@@ -89,7 +89,14 @@ public class DesktopVisualizer extends MusicManagerFFT implements Visualizer {
 	}
 	
 	private void bufferChanged() {
-		playingBuffer.clear();
+		//set position to beginning to prepare for overwrite
+		playingBuffer.position(0);
+		//if the backing playing buffer is full, we have two sections: A and B. A is the one before B, and is read from due to playback latency and offset. B is merely a buffer.
+		if (playingBuffer.limit() == playingBuffer.capacity()) {
+			//put the second portion into the first...
+			playingBuffer.put(playingBuffer.array(), buffer.capacity(), buffer.capacity());
+		}
+		//put the new buffer in the second portion.
 		playingBuffer.put(compareBuffer);
 	}
 	
@@ -118,7 +125,7 @@ public class DesktopVisualizer extends MusicManagerFFT implements Visualizer {
 		}
 		int originalPos = buffer.position();
 
-		playingBuffer = ShortBuffer.allocate(buffer.capacity());
+		playingBuffer = ShortBuffer.allocate(buffer.capacity()*2);
 		buffer.rewind();
 		playingBuffer.put(buffer);
 		playingBuffer.flip();