diff --git a/main-play.h b/main-play.h
index fd2b7b9..ca34163 100644
--- a/main-play.h
+++ b/main-play.h
@@ -51,6 +51,7 @@ void doPlay(bool forceDisplayUpdate) {
     updateDisplay = true;
   }
 
+  diag("%d %f", pipe.keys, pipe.glissandoOpenness);
 #if 0
   if (updateDisplay) {
     // Look up the note name
diff --git a/pipe.cpp b/pipe.cpp
index e322b9e..e5c82ec 100644
--- a/pipe.cpp
+++ b/pipe.cpp
@@ -47,22 +47,28 @@ void Pipe::Update() {
   // 0x6c is actually 8 bytes, but all 8 are always the same...
   paj7620ReadReg(0x6c, 1, &kneeClosedness);
 
-  for (int i = 0; i < NUM_KEYS; i++) {
+  for (int i = 0; i < NUM_KEYS; ++i) {
     uint16_t val = max(capSensor.filteredData(i), CLOSEDVAL);
-    float openness = ((val - CLOSEDVAL) / float(GLISSANDO_STEPS));
+    keyOpen[i] = ((val - CLOSEDVAL) / float(GLISSANDO_STEPS));
 
     // keys = all keys which are at least touched
     // glissandoKeys = all keys which are fully closed
     // The glissando operation computes the difference.
-    if (openness < 1.0) {
-      glissandoOpenness = max(glissandoOpenness, openness);
+    if (keyOpen[i] < 1.0) {
+      glissandoOpenness = max(glissandoOpenness, keyOpen[i]);
       bitSet(keys, i);
     }
-    if (openness == 0.0) {
+    if (keyOpen[i] == 0.0) {
       bitSet(glissandoKeys, i);
     }
   }
 
+  // Compute glissando amount
+  glissandoOpenness = 0.0;
+  for (int i = 0; i < 8; ++i) {
+    glissandoOpenness = max(glissandoOpenness, keyOpen[i]);
+  }
+
   // Look up notes in the big table
   struct Fingering f = FingeredNote(keys);
   struct Fingering gf = FingeredNote(glissandoKeys);
diff --git a/pipe.h b/pipe.h
index 0f2ea0f..8203b7a 100644
--- a/pipe.h
+++ b/pipe.h
@@ -6,7 +6,7 @@
 #include <stdint.h>
 #include "tuning.h"
 
-#define NUM_KEYS 12
+#define NUM_KEYS 8
 
 enum Adjust {
   ADJUST_DOWN = -1,
@@ -23,6 +23,7 @@ class Pipe {
   // keys are which keys are being pressed.
   uint16_t keys;
   uint16_t keysLast;
+  float keyOpen[NUM_KEYS];
 
   // note holds the note being played, according to the fingering chart.
   Note note;