Run in P2D mode. Much more efficient using OpenGL.

examples/BasicOptical/BasicOptical.pde

@@ -11,9 +11,10 @@ String pitch = "long";                    			//whether the film is "long" or "sh
 boolean positive = true;                  			//whether the film is positive or negative
 
 void setup() {
-  size(213, 620);								//this will perfectly fill the frame with the soundtrack @ 2400DPI
+  size(213, 620, P2D);								//this will perfectly fill the frame with the soundtrack @ 2400DPI
+  													//must run in P2D or P2D (acheives realtime playback easier)
   
-  frameRate(24); 								//this will playback at realtime speed
+  frameRate(24); 									//this will playback at realtime speed
   soundtrack = new SoundtrackOptical(this, soundtrackFile, dpi, volume, type, pitch, positive);
 }
 

examples/OpticalWithPlayback/OpticalWithPlayback.pde

@@ -12,12 +12,12 @@ String pitch = "long";
 boolean positive = true;
 
 void setup() {
-  size(213, 620);
+  size(213, 620, P2D);
   frameRate(24);
   soundtrack = new SoundtrackOptical(this, soundtrackFile, dpi, volume, type, pitch, positive);
   playback = new SoundFile(this, soundtrackFile);
 
-  playback.play();
+  playback.play(); //playback alongside image
 }
 
 void draw () {

src/soundtrack/optical/SoundtrackOptical.java

@@ -63,7 +63,7 @@ public class SoundtrackOptical {
     FRAMES = (int) Math.ceil(soundfile.frames() / RAW_FRAME_H);
     
     frameSample = new float[RAW_FRAME_H];
-    raw = parent.createGraphics(RAW_FRAME_W, RAW_FRAME_H);
+    raw = parent.createGraphics(RAW_FRAME_W, RAW_FRAME_H, parent.P2D);
 
         
     for (int x = 0; x < soundfile.frames(); x++) {