diff --git a/arduino/rainboard/sketch.yaml b/arduino/rainboard/sketch.yaml
new file mode 100644
index 0000000..ecbfa50
--- /dev/null
+++ b/arduino/rainboard/sketch.yaml
@@ -0,0 +1,2 @@
+default_port: /dev/tty.usbserial-1410
+default_fqbn: esp32:esp32:esp32s2:UploadSpeed=460800
diff --git a/arduino/rainboard/src/rainboard.ino b/arduino/rainboard/src/rainboard.ino
index 7e670cd..94d57d6 100644
--- a/arduino/rainboard/src/rainboard.ino
+++ b/arduino/rainboard/src/rainboard.ino
@@ -32,14 +32,14 @@ int n_keychg = 0;
 // --> for monitoring only 'changed' keys.
 
 #define NUMCOLS 14
-int pins_cols[NUMCOLS] = {19, 20, 18, 17, 15, 16, 40, 39, 38, 37, 36, 35, 34, 33}; //16
+int pins_cols[NUMCOLS] = {40, 39, 38, 37, 36, 35, 34, 33, 19, 20, 18, 17, 15, 16}; //16
 // --> cols is horizontal offsets on the board
 // --> to be read as input.
 
 #define NUMROWS 3
 int pins_rows[NUMROWS] = {6, 7, 8};
 // --> rows is vertical offsets on the board
-// --> to be driven as output.
+// --> to be driven as output (or high impedance)
 
 void setup()
 {
@@ -47,11 +47,6 @@ void setup()
   Serial.begin(115200);
 
   //pinmodes
-  // rows : to be driven as output. (scanning)
-  for (int idx = 0; idx < NUMROWS; idx++) {
-    pinMode(pins_rows[idx], OUTPUT);
-    digitalWrite(pins_rows[idx], HIGH);
-  }
   // cols : to be read as input. (PULL-UP)
   for (int idx = 0; idx < NUMCOLS; idx++) {
     pinMode(pins_cols[idx], INPUT_PULLUP);
@@ -87,12 +82,13 @@ void loop()
 
   // update row voltages
   static int row = 0;
-  digitalWrite(pins_rows[row], HIGH); // let old 'on' row goes 'off' first.
+  pinMode(pins_rows[row], INPUT); // let old 'on' row goes 'hi-z' first.
   row++;
   if (row >= NUMROWS) {
     row = 0;
   }
-  digitalWrite(pins_rows[row], LOW); // let new 'off' row goes 'on'.. -> ready to scan.
+  pinMode(pins_rows[row], OUTPUT);
+  digitalWrite(pins_rows[row], LOW); // let new 'hi-z' row goes 'on'.. -> ready to scan.
 
   // 100us ~ 200us, waiting for the electricity ready...
   delayMicroseconds(200);
@@ -133,11 +129,11 @@ void loop()
     // }
     // Serial.println();
 
-    // // print out the changes.
-    // for (int chg = 0; chg < n_keychg; chg++) {
-    //   Serial.print(keychanges[chg]);
-    //   Serial.println();
-    // }
+    // print out the changes.
+    for (int chg = 0; chg < n_keychg; chg++) {
+      Serial.print(keychanges[chg]);
+      Serial.print(" ");
+    }
 
     // clear 'keychanges' array
     for (int idx = 0; idx < MAXCHANGES; idx++) {
diff --git a/ringringrain_rev2.pd b/ringringrain_rev2.pd
index 9de8650..b1cf374 100644
--- a/ringringrain_rev2.pd
+++ b/ringringrain_rev2.pd
@@ -1,81 +1,39 @@
-#N canvas 0 33 1016 615 10;
-#X obj 597 87 loadbang;
+#N canvas 0 93 831 615 10;
+#X obj 417 87 loadbang;
 #N canvas 0 22 450 300 (subpatch) 0;
 #X array raining 2.57403e+06 float 0;
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-#X obj 739 399 *~;
-#X obj 739 438 hip~ 5;
-#X msg 612 291 bang;
-#X obj 690 338 bng 15 250 50 0 empty empty empty 17 7 0 10 #fcfcfc
+#X restore 690 87 graph;
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+#X obj 417 144 soundfiler;
+#X floatatom 417 167 0 0 0 0 - - - 0;
+#X obj 417 348 env~ 16384;
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-#X obj 612 217 delay 2000;
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+#X floatatom 574 349 5 0 0 0 - - - 0;
+#X obj 432 217 delay 2000;
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-#X text 356 30 Automatically turn on audio;
-#X text 356 40 8 seconds after patch opens.;
-#X obj 358 79 delay 8000;
+#X obj 23 379 loadbang;
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-#X text 602 28 sound generators - sample sound;
-#X obj 447 106 print dsp_bang;
-#X obj 358 171 print dsp_load;
+#X text 422 28 sound generators - sample sound;
 #X obj 26 68 arduino-wifi;
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