diff --git a/src/2023-06-21.festl_is/Makefile b/src/2023-06-21.festl_is/Makefile
index 57bcf89..a497bc6 100644
--- a/src/2023-06-21.festl_is/Makefile
+++ b/src/2023-06-21.festl_is/Makefile
@@ -2,7 +2,7 @@
 # glslViewer order matters, single-dash options need to be before doubledashes? (at least for -p)
 
 test:
-	glslViewer main.frag video.mp4 -w 960 -h 540 -p 8881 -e "error_screen,off" --nocursor --fps30
+	glslViewer main.frag video.mp4 -w 960 -h 540 -p 4242 -e "error_screen,off" --nocursor --fps30
 
 test-gits:
-	glslViewer main.frag gits.mp4 -w 960 -h 540 -p 8881 -e "error_screen,off" --nocursor --fps30
+	glslViewer main.frag gits.mp4 -w 960 -h 540 -p 4242 -e "error_screen,off" --nocursor --fps30
diff --git a/src/2023-06-21.festl_is/processing_sketches/audio_processing_gui/GUI_BUILDER_DATA/gui.ser.4.4 b/src/2023-06-21.festl_is/processing_sketches/audio_processing_gui/GUI_BUILDER_DATA/gui.ser.4.4
new file mode 100644
index 0000000..7bb8ca8
Binary files /dev/null and b/src/2023-06-21.festl_is/processing_sketches/audio_processing_gui/GUI_BUILDER_DATA/gui.ser.4.4 differ
diff --git a/src/2023-06-21.festl_is/processing_sketches/audio_processing_gui/audioAnalysis.pde b/src/2023-06-21.festl_is/processing_sketches/audio_processing_gui/audioAnalysis.pde
new file mode 100644
index 0000000..7546d7f
--- /dev/null
+++ b/src/2023-06-21.festl_is/processing_sketches/audio_processing_gui/audioAnalysis.pde
@@ -0,0 +1,51 @@
+import ddf.minim.*;
+import ddf.minim.analysis.*;
+
+Minim minim;
+AudioInput myAudio;
+
+// beat detection with sound energy 
+BeatDetect myBeat;
+int myBeatMax = 20; // sync with gui
+int myBeatCurrent = 0;
+
+FFT myFFT;
+
+void setupAudioAnalysis() {
+  minim = new Minim(this);
+  myAudio = minim.getLineIn(); // Minim.STEREO, bufferSize=1024,  sampleRate=44100, int bitDepth=16
+
+  // beat detection setup
+  myBeat = new BeatDetect();
+
+  // fft setup
+  myFFT = new FFT(myAudio.bufferSize(), myAudio.sampleRate());
+  myFFT.logAverages(22, 12); // (22,12) -> 120 averages
+  myFFT.window(FFT.NONE);
+
+  // debug
+  println("[debug][audio]: number of fft bins: "+myFFT.avgSize());
+}
+
+void drawAudioAnalysis() {
+  // beat detection processing
+  if(myBeatCurrent > 0) {
+    myBeatCurrent--; // linear decay
+  }
+  myBeat.detect(myAudio.mix);
+  if(myBeat.isOnset()) {
+    myBeatCurrent = myBeatMax;
+  }
+  // draw beat detection
+  fill(0);noStroke();
+  rect(160,40,40,40);
+  fill(255);
+  circle(160+20,40+20,getBeatDetectNormalized()*36);
+  
+  // fft processing
+  
+}
+
+float getBeatDetectNormalized() {
+  return (myBeatCurrent / float(myBeatMax));
+}
diff --git a/src/2023-06-21.festl_is/processing_sketches/audio_processing_gui/audio_processing_gui.pde b/src/2023-06-21.festl_is/processing_sketches/audio_processing_gui/audio_processing_gui.pde
new file mode 100644
index 0000000..dcc921e
--- /dev/null
+++ b/src/2023-06-21.festl_is/processing_sketches/audio_processing_gui/audio_processing_gui.pde
@@ -0,0 +1,22 @@
+import g4p_controls.*;
+
+
+
+color bgColor = #333344;
+
+void setup() {
+  size(900,900);
+  frameRate(30);
+  background(bgColor);
+  
+  setupAudioAnalysis();
+  
+  createGUI();
+}
+
+void draw() {
+  background(bgColor);
+  
+  drawAudioAnalysis();
+
+}
diff --git a/src/2023-06-21.festl_is/processing_sketches/audio_processing_gui/data/list_384393 b/src/2023-06-21.festl_is/processing_sketches/audio_processing_gui/data/list_384393
new file mode 100644
index 0000000..ad4b5f7
--- /dev/null
+++ b/src/2023-06-21.festl_is/processing_sketches/audio_processing_gui/data/list_384393
@@ -0,0 +1,10 @@
+none
+bartlett
+bartletthann
+blackmann
+cosine
+gauss
+hammin
+hann
+lanczos
+triangular
diff --git a/src/2023-06-21.festl_is/processing_sketches/audio_processing_gui/gui.pde b/src/2023-06-21.festl_is/processing_sketches/audio_processing_gui/gui.pde
new file mode 100644
index 0000000..bfb42c6
--- /dev/null
+++ b/src/2023-06-21.festl_is/processing_sketches/audio_processing_gui/gui.pde
@@ -0,0 +1,142 @@
+/* =========================================================
+ * ====                   WARNING                        ===
+ * =========================================================
+ * The code in this tab has been generated from the GUI form
+ * designer and care should be taken when editing this file.
+ * Only add/edit code inside the event handlers i.e. only
+ * use lines between the matching comment tags. e.g.
+
+ void myBtnEvents(GButton button) { //_CODE_:button1:12356:
+     // It is safe to enter your event code here  
+ } //_CODE_:button1:12356:
+ 
+ * Do not rename this tab!
+ * =========================================================
+ */
+
+public void gui_fftWindowing_click(GDropList source, GEvent event) { //_CODE_:gui_fftWindowing:384393:
+  //println("dropList1 - GDropList >> GEvent." + event + " @ " + millis());
+  String selected = source.getSelectedText();
+  switch(selected) {
+  case "bartlett":
+    myFFT.window(FFT.BARTLETT);
+  case "bartletthann":
+    myFFT.window(FFT.BARTLETTHANN);
+  case "blackmann":
+    myFFT.window(FFT.BLACKMAN);
+  case "cosine":
+    myFFT.window(FFT.COSINE);
+  case "gauss":
+    myFFT.window(FFT.GAUSS);
+  case "hammin":
+    myFFT.window(FFT.HAMMING);
+  case "hann":
+    myFFT.window(FFT.HANN);
+  case "lanczos":
+    myFFT.window(FFT.LANCZOS);
+  case "triangular":
+    myFFT.window(FFT.TRIANGULAR);
+  case "none":
+  default:
+    myFFT.window(FFT.NONE);
+  }
+} //_CODE_:gui_fftWindowing:384393:
+
+public void gui_fftAmpBeginFrac_change(GSlider source, GEvent event) { //_CODE_:gui_fftAmpBeginFrac:516902:
+  println("slider1 - GSlider >> GEvent." + event + " @ " + millis());
+} //_CODE_:gui_fftAmpBeginFrac:516902:
+
+public void gui_baseAmp_change(GSlider source, GEvent event) { //_CODE_:gui_baseAmp:888464:
+  println("slider2 - GSlider >> GEvent." + event + " @ " + millis());
+} //_CODE_:gui_baseAmp:888464:
+
+public void gui_ampStart_change(GSlider source, GEvent event) { //_CODE_:gui_ampStart:865325:
+  println("slider1 - GSlider >> GEvent." + event + " @ " + millis());
+} //_CODE_:gui_ampStart:865325:
+
+public void gui_ampStep_change(GSlider source, GEvent event) { //_CODE_:gui_ampStep:498343:
+  println("slider2 - GSlider >> GEvent." + event + " @ " + millis());
+} //_CODE_:gui_ampStep:498343:
+
+public void gui_beatDecay_change(GSlider source, GEvent event) { //_CODE_:gui_beatDecay:302227:
+  println("gui_beatDecay - GSlider >> GEvent." + event + " @ " + millis());
+  myBeatMax = source.getValueI();
+} //_CODE_:gui_beatDecay:302227:
+
+
+
+// Create all the GUI controls. 
+// autogenerated do not edit
+public void createGUI(){
+  G4P.messagesEnabled(false);
+  G4P.setGlobalColorScheme(GCScheme.CYAN_SCHEME);
+  G4P.setMouseOverEnabled(false);
+  GButton.useRoundCorners(false);
+  surface.setTitle("Sketch Window");
+  gui_fftWindowing = new GDropList(this, 100, 110, 100, 220, 10, 10);
+  gui_fftWindowing.setItems(loadStrings("list_384393"), 0);
+  gui_fftWindowing.addEventHandler(this, "gui_fftWindowing_click");
+  label1 = new GLabel(this, 20, 110, 80, 20);
+  label1.setText("windowing:");
+  label1.setOpaque(true);
+  label2 = new GLabel(this, 20, 140, 180, 20);
+  label2.setText("amp begin at bin fraction");
+  label2.setOpaque(true);
+  label3 = new GLabel(this, 20, 210, 180, 20);
+  label3.setText("base amp");
+  label3.setOpaque(true);
+  label4 = new GLabel(this, 20, 280, 180, 20);
+  label4.setText("amp start");
+  label4.setOpaque(true);
+  gui_fftAmpBeginFrac = new GSlider(this, 20, 160, 180, 40, 10.0);
+  gui_fftAmpBeginFrac.setShowValue(true);
+  gui_fftAmpBeginFrac.setLimits(0.3, 0.0, 1.0);
+  gui_fftAmpBeginFrac.setNumberFormat(G4P.DECIMAL, 2);
+  gui_fftAmpBeginFrac.setOpaque(true);
+  gui_fftAmpBeginFrac.addEventHandler(this, "gui_fftAmpBeginFrac_change");
+  gui_baseAmp = new GSlider(this, 20, 230, 180, 40, 10.0);
+  gui_baseAmp.setShowValue(true);
+  gui_baseAmp.setLimits(30.0, 1.0, 100.0);
+  gui_baseAmp.setNumberFormat(G4P.DECIMAL, 2);
+  gui_baseAmp.setOpaque(true);
+  gui_baseAmp.addEventHandler(this, "gui_baseAmp_change");
+  label5 = new GLabel(this, 20, 350, 180, 20);
+  label5.setText("amp step");
+  label5.setOpaque(true);
+  gui_ampStart = new GSlider(this, 20, 300, 180, 40, 10.0);
+  gui_ampStart.setShowValue(true);
+  gui_ampStart.setLimits(0.05, 0.005, 0.2);
+  gui_ampStart.setNumberFormat(G4P.DECIMAL, 3);
+  gui_ampStart.setOpaque(true);
+  gui_ampStart.addEventHandler(this, "gui_ampStart_change");
+  gui_ampStep = new GSlider(this, 20, 370, 180, 40, 10.0);
+  gui_ampStep.setShowValue(true);
+  gui_ampStep.setLimits(0.02, 0.005, 0.2);
+  gui_ampStep.setNumberFormat(G4P.DECIMAL, 3);
+  gui_ampStep.setOpaque(true);
+  gui_ampStep.addEventHandler(this, "gui_ampStep_change");
+  label6 = new GLabel(this, 20, 20, 180, 20);
+  label6.setText("simple beat decay");
+  label6.setOpaque(true);
+  gui_beatDecay = new GSlider(this, 20, 40, 140, 40, 10.0);
+  gui_beatDecay.setShowValue(true);
+  gui_beatDecay.setLimits(30.0, 1.0, 60.0);
+  gui_beatDecay.setNumberFormat(G4P.DECIMAL, 2);
+  gui_beatDecay.setOpaque(true);
+  gui_beatDecay.addEventHandler(this, "gui_beatDecay_change");
+}
+
+// Variable declarations 
+// autogenerated do not edit
+GDropList gui_fftWindowing; 
+GLabel label1; 
+GLabel label2; 
+GLabel label3; 
+GLabel label4; 
+GSlider gui_fftAmpBeginFrac; 
+GSlider gui_baseAmp; 
+GLabel label5; 
+GSlider gui_ampStart; 
+GSlider gui_ampStep; 
+GLabel label6; 
+GSlider gui_beatDecay; 
diff --git a/src/2023-06-21.festl_is/processing_sketches/audio_processing_gui/oscThings.pde b/src/2023-06-21.festl_is/processing_sketches/audio_processing_gui/oscThings.pde
new file mode 100644
index 0000000..e69de29
diff --git a/src/2023-06-21.festl_is/processing_sketches/audio_processing_gui/user_gui_palette.png b/src/2023-06-21.festl_is/processing_sketches/audio_processing_gui/user_gui_palette.png
new file mode 100644
index 0000000..01204e5
Binary files /dev/null and b/src/2023-06-21.festl_is/processing_sketches/audio_processing_gui/user_gui_palette.png differ
diff --git a/src/2023-06-21.festl_is/processing_sketches/audio_processing_with_touchosc/audio.pde b/src/2023-06-21.festl_is/processing_sketches/audio_processing_with_touchosc/audio.pde
new file mode 100644
index 0000000..3846696
--- /dev/null
+++ b/src/2023-06-21.festl_is/processing_sketches/audio_processing_with_touchosc/audio.pde
@@ -0,0 +1,52 @@
+import ddf.minim.*;
+import ddf.minim.analysis.*;
+
+Minim minim;
+AudioInput myAudio;
+
+// beat detection with sound energy 
+BeatDetect myBeat;
+final int BEAT_MAX = 60;
+int myBeatMax = 20; // sync with gui
+int myBeatCurrent = 0;
+
+FFT myFFT;
+
+void setupAudioAnalysis() {
+  minim = new Minim(this);
+  myAudio = minim.getLineIn(); // Minim.STEREO, bufferSize=1024,  sampleRate=44100, int bitDepth=16
+
+  // beat detection setup
+  myBeat = new BeatDetect();
+
+  // fft setup
+  myFFT = new FFT(myAudio.bufferSize(), myAudio.sampleRate());
+  myFFT.logAverages(22, 12); // (22,12) -> 120 averages
+  myFFT.window(FFT.NONE);
+
+  // debug
+  println("[debug][audio]: number of fft bins: "+myFFT.avgSize());
+}
+
+void drawAudioAnalysis() {
+  // beat detection processing
+  if(myBeatCurrent > 0) {
+    myBeatCurrent--; // linear decay
+  }
+  myBeat.detect(myAudio.mix);
+  if(myBeat.isOnset()) {
+    myBeatCurrent = myBeatMax;
+  }
+  // draw beat detection
+  fill(0);noStroke();
+  rect(20,20,40,40);
+  fill(255);
+  circle(20+20,20+20,getBeatDetectNormalized()*36);
+  
+  // fft processing
+  
+}
+
+float getBeatDetectNormalized() {
+  return constrain((myBeatCurrent / float(myBeatMax)), 0.0f, 1.0f);
+}
diff --git a/src/2023-06-21.festl_is/processing_sketches/audio_processing_with_touchosc/audio_processing_with_touchosc.pde b/src/2023-06-21.festl_is/processing_sketches/audio_processing_with_touchosc/audio_processing_with_touchosc.pde
new file mode 100644
index 0000000..d09cbf3
--- /dev/null
+++ b/src/2023-06-21.festl_is/processing_sketches/audio_processing_with_touchosc/audio_processing_with_touchosc.pde
@@ -0,0 +1,19 @@
+color bgColor = #333344;
+
+void setup() {
+  size(900,900);
+  frameRate(30);
+  background(bgColor);
+  
+  setupOsc();
+  
+  setupAudioAnalysis();
+}
+
+void draw() {
+  background(bgColor);
+  
+  drawOsc();
+  
+  drawAudioAnalysis();
+}
diff --git a/src/2023-06-21.festl_is/processing_sketches/audio_processing_with_touchosc/oscStuff.pde b/src/2023-06-21.festl_is/processing_sketches/audio_processing_with_touchosc/oscStuff.pde
new file mode 100644
index 0000000..3e1f477
--- /dev/null
+++ b/src/2023-06-21.festl_is/processing_sketches/audio_processing_with_touchosc/oscStuff.pde
@@ -0,0 +1,35 @@
+import oscP5.*;
+import netP5.*;
+
+OscP5 oscObj;
+final int RECEIVEPORT = 13337;
+final int SENDPORT = 4242;
+NetAddress shaderNetAddress;
+
+// sends osc messages
+void setupOsc() {
+  oscObj = new OscP5(this, RECEIVEPORT);
+  shaderNetAddress = new NetAddress("127.0.0.1", SENDPORT);
+}
+
+void drawOsc() {
+  if (frameCount % 5 == 0) {
+    OscMessage msg = new OscMessage("/osc_beat_val");
+    msg.add(getBeatDetectNormalized());
+    oscObj.send(msg, shaderNetAddress);
+  }
+}
+
+// reacts to osc messages
+void oscEvent(OscMessage msgIn) {
+  //print("### received an osc message.");
+  //print(" addrpattern: "+msgIn.addrPattern());
+  //println(" typetag: "+msgIn.typetag());
+  if (msgIn.checkAddrPattern("/beat_decay")==true) {
+    if (msgIn.checkTypetag("f")) {
+      myBeatMax = max(int(BEAT_MAX*msgIn.get(0).floatValue()), 1);
+      //println("   myBeatMax: "+myBeatMax+"  f: "+msgIn.get(0).floatValue());
+      return;
+    }
+  }
+}
diff --git a/src/2023-06-21.festl_is/todo.md b/src/2023-06-21.festl_is/todo.md
index bbd292f..fa4e198 100644
--- a/src/2023-06-21.festl_is/todo.md
+++ b/src/2023-06-21.festl_is/todo.md
@@ -22,6 +22,7 @@
         * [X] how does it default if no input is coming? can I adjust from glslViewer cli? -> black or last frame, doesn't matter
     * glslViewer
         * [.] passes
+            * [ ] look at inspiration: https://github.com/butterw/bShaders
             * [X] brigthness pass
                 * [X] POC
             * [ ] edge detection pass