diff --git a/bell/src/main.cpp b/bell/src/main.cpp
index dedb3eb..4782024 100644
--- a/bell/src/main.cpp
+++ b/bell/src/main.cpp
@@ -155,7 +155,8 @@ Task nothappyalone_task(100, TASK_FOREVER, &nothappyalone); // by default, ENABL
 #define SERVO_PIN D6
 #include <Servo.h>
 Servo myservo;
-#define HITTING_ANGLE 87
+// #define HITTING_ANGLE 87
+#define HITTING_ANGLE 90
 #define RELEASE_ANGLE 60
 #define STABILIZE_ANGLE 53
 
diff --git a/gastank/src/main.cpp b/gastank/src/main.cpp
index d915a9e..3c4f796 100644
--- a/gastank/src/main.cpp
+++ b/gastank/src/main.cpp
@@ -177,41 +177,60 @@ void side_release() {
 }
 Task side_release_task(0, TASK_ONCE, &side_release);
 
-// ring_head.
 static Servo head;
 extern Task head_release_task;
-extern Task ring_head_task;
-// ring_head!
 void ring_head() {
-  static int count = 0;
-  if (ring_head_task.isFirstIteration()) {
-    count = 0;
-    Serial.println("ring_head! start.");
-  }
-  if (count % 3 == 0) {
-    //
-    head.attach(D5);
-    head.write(170);
-    //
-  } else if (count % 3 == 1) {
-    //
-    head.detach();
-    //
-  } else {
-    //
-    head.attach(D5);
-    head.write(100);
-    head_release_task.restartDelayed(100);
-  }
+  int angle = random(0, 90);
   //
-  count++;
+  Serial.print("ring_head go -> ");
+  Serial.print(angle);
+  Serial.println(" deg.");
+  //
+  head.attach(D5);
+  head.write(angle);
+  head_release_task.restartDelayed(100);
 }
-Task ring_head_task(100, 3, &ring_head);
+Task ring_head_task(0, TASK_ONCE, &ring_head);
 void head_release() {
   head.detach();
 }
 Task head_release_task(0, TASK_ONCE, &head_release);
 
+// ring_head.
+// static Servo head;
+// extern Task head_release_task;
+// extern Task ring_head_task;
+// // ring_head!
+// void ring_head() {
+//   static int count = 0;
+//   if (ring_head_task.isFirstIteration()) {
+//     count = 0;
+//     Serial.println("ring_head! start.");
+//   }
+//   if (count % 3 == 0) {
+//     //
+//     head.attach(D5);
+//     head.write(70);
+//     //
+//   } else if (count % 3 == 1) {
+//     //
+//     head.detach();
+//     //
+//   } else {
+//     //
+//     head.attach(D5);
+//     head.write(0);
+//     head_release_task.restartDelayed(100);
+//   }
+//   //
+//   count++;
+// }
+// Task ring_head_task(100, 3, &ring_head);
+// void head_release() {
+//   head.detach();
+// }
+// Task head_release_task(0, TASK_ONCE, &head_release);
+
 // mesh callbacks
 void receivedCallback(uint32_t from, String & msg) { // REQUIRED
   Serial.print("got msg.: ");
diff --git a/puredata/piano_access_mesh.pd b/puredata/piano_access_mesh.pd
index 8c6dcb4..cfa2fba 100644
--- a/puredata/piano_access_mesh.pd
+++ b/puredata/piano_access_mesh.pd
@@ -1,4 +1,4 @@
-#N canvas 1 89 1285 589 10;
+#N canvas 85 23 1308 582 10;
 #X obj 20 126 unpackOSC;
 #X obj 107 18 loadbang;
 #X msg 147 91 devices;
@@ -352,7 +352,7 @@ region stretch range etc.;
 #X connect 122 0 111 0;
 #X connect 125 0 33 0;
 #X connect 126 0 115 0;
-#X restore 292 299 pd crickets ctrl;
+#X restore 10 426 pd crickets ctrl;
 #X obj 896 154 print OSC;
 #X obj 698 295 int;
 #X obj 1207 92 s NOTE;
@@ -404,7 +404,7 @@ pollintervall 1 \, verbose 1;
 #X msg 1199 444 68 100 0;
 #X text 943 370 vol. control knob 'on' the keyboard is needed. instead
 of get/set it by other devivce this is quite messy!;
-#N canvas 328 89 875 805 crickets 0;
+#N canvas 328 24 875 805 crickets 1;
 #X obj 89 492 pack f f;
 #X obj 134 466 tgl 15 0 empty \$0-c-tgl r:0-c-tgl 17 7 0 10 -262144
 -1 -1 0 1;
@@ -640,247 +640,418 @@ region stretch range etc.;
 #X connect 96 0 94 0;
 #X connect 97 0 2 0;
 #X connect 114 0 33 0;
-#X restore 320 321 pd crickets new;
-#N canvas 81 89 1282 797 crickets 1;
-#X obj 89 492 pack f f;
-#X obj 134 466 tgl 15 0 empty \$0-c-tgl r:0-c-tgl 17 7 0 10 -262144
+#X restore 10 448 pd crickets new;
+#N canvas 0 23 1298 805 crickets 1;
+#X obj 83 492 pack f f;
+#X obj 128 466 tgl 15 0 empty \$0-c-tgl r:0-c-tgl 17 7 0 10 -262144
+-1 -1 1 1;
+#X obj 86 420 hsl 128 15 0 300 0 0 empty empty empty -2 -8 0 10 -262144
 -1 -1 0 1;
-#X obj 92 420 hsl 128 15 0 300 0 0 empty empty empty -2 -8 0 10 -262144
+#X floatatom 93 440 5 0 0 0 - - -;
+#X msg 83 513 120 \$1 \$2;
+#X obj 233 492 pack f f;
+#X obj 278 466 tgl 15 0 empty \$0-c-tgl r:0-c-tgl 17 7 0 10 -262144
+-1 -1 1 1;
+#X obj 236 420 hsl 128 15 0 300 0 0 empty empty empty -2 -8 0 10 -262144
 -1 -1 0 1;
-#X floatatom 99 440 5 0 0 0 - - -;
-#X msg 89 521 120 \$1 \$2;
-#X obj 239 492 pack f f;
-#X obj 284 466 tgl 15 0 empty \$0-c-tgl r:0-c-tgl 17 7 0 10 -262144
+#X floatatom 243 440 5 0 0 0 - - -;
+#X msg 233 513 121 \$1 \$2;
+#X obj 1103 634 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1
+0 1;
+#X obj 1103 658 t b a;
+#X msg 1150 618 0;
+#X obj 383 492 pack f f;
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+-1 -1 1 1;
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 -1 -1 0 1;
-#X obj 242 420 hsl 128 15 0 300 0 0 empty empty empty -2 -8 0 10 -262144
+#X floatatom 393 440 5 0 0 0 - - -;
+#X msg 383 513 122 \$1 \$2;
+#X obj 533 492 pack f f;
+#X obj 578 466 tgl 15 0 empty \$0-c-tgl r:0-c-tgl 17 7 0 10 -262144
+-1 -1 1 1;
+#X obj 536 420 hsl 128 15 0 300 0 0 empty empty empty -2 -8 0 10 -262144
 -1 -1 0 1;
-#X floatatom 249 440 5 0 0 0 - - -;
-#X msg 239 521 121 \$1 \$2;
-#X obj 797 65 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 0
+#X floatatom 543 440 5 0 0 0 - - -;
+#X msg 533 513 123 \$1 \$2;
+#X obj 461 705 pack f f;
+#X obj 506 679 tgl 15 0 empty \$0-c-tgl r:0-c-tgl 17 7 0 10 -262144
+-1 -1 1 1;
+#X obj 464 633 hsl 128 15 0 255 0 0 empty empty empty -2 -8 0 10 -262144
+-1 -1 0 1;
+#X obj 461 758 s CTRL;
+#X floatatom 471 653 5 0 0 0 - - -;
+#X msg 461 726 127 \$1 \$2;
+#X text 527 601 fishing-fly;
+#X obj 437 115 s CTRL;
+#X text 993 655 cricket drummers;
+#X obj 1140 687 tgl 15 0 \$0-c-tgl empty s:0-c-tgl 17 7 0 10 -262144
+-1 -1 0 1;
+#X floatatom 533 389 5 0 0 0 r:0-c-sld #0-c-sld -;
+#X floatatom 383 389 5 0 0 0 r:0-c-sld #0-c-sld -;
+#X floatatom 233 389 5 0 0 0 r:0-c-sld #0-c-sld -;
+#X floatatom 83 389 5 0 0 0 r:0-c-sld #0-c-sld -;
+#X floatatom 1103 687 5 0 0 0 s:0-c-sld - #0-c-sld;
+#X floatatom 461 602 5 0 0 0 r:0-c-sld #0-c-sld -;
+#X msg 437 94 105 100 1;
+#X obj 83 545 s CTRL;
+#X obj 233 545 s CTRL;
+#X obj 383 545 s CTRL;
+#X obj 533 545 s CTRL;
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+#X floatatom 167 152 5 0 0 3 slider - -;
+#X obj 228 152 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 0
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-#X obj 797 89 t b a;
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-#X obj 389 492 pack f f;
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--1 -1 0 1;
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-#X msg 539 521 123 \$1 \$2;
-#X obj 539 702 pack f f;
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--1 -1 0 1;
-#X obj 542 630 hsl 128 15 0 255 0 0 empty empty empty -2 -8 0 10 -262144
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-#X obj 539 763 s CTRL;
-#X floatatom 549 650 5 0 0 0 - - -;
-#X msg 539 731 127 \$1 \$2;
-#X text 605 598 fishing-fly;
-#X obj 744 326 s CTRL;
-#X obj 271 709 metro 1000;
-#X obj 271 687 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 0
+#X obj 288 152 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 0
 1;
-#X text 270 657 auto play;
-#X msg 134 711 100 100 1;
-#X msg 136 766 101 100 1;
-#X text 145 690 gastank;
-#X text 140 741 float;
-#X msg 313 637 0;
-#X msg 355 659 1000;
-#X obj 704 705 metro 1000;
-#X obj 704 683 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 0
+#X obj 349 152 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 0
 1;
-#X floatatom 783 690 5 0 0 0 - - -;
-#X text 703 653 auto play;
-#X msg 746 633 0;
-#X msg 788 655 1000;
-#X msg 704 727 101 127 1;
-#X msg 271 731 100 127 1;
-#X msg 350 630 500;
-#X msg 386 628 2000;
-#X msg 374 604 300;
-#X msg 404 584 3000;
-#X obj 271 755 s CTRL;
-#X obj 704 751 s CTRL;
-#X text 767 30 cricket drummers;
-#X obj 834 118 tgl 15 0 \$0-c-tgl empty s:0-c-tgl 17 7 0 10 -262144
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-#X floatatom 539 389 5 0 0 0 r:0-c-sld #0-c-sld -;
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-#X floatatom 89 389 5 0 0 0 r:0-c-sld #0-c-sld -;
-#X floatatom 797 118 5 0 0 0 s:0-c-sld - #0-c-sld;
-#X floatatom 539 599 5 0 0 0 r:0-c-sld #0-c-sld -;
-#X obj 20 50 arduino;
-#X msg 147 51 devices;
-#X msg 215 68 close;
-#X msg 20 12 devicename /dev/tty.HC-06-DevB \, baud 57600 \, pollintervall
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-#X obj 20 71 route analog;
-#X obj 20 92 route 0 1 2 3 4 5;
-#X floatatom 110 147 5 0 0 3 top/right - -;
-#X floatatom 73 167 5 0 0 3 top/center - -;
-#X floatatom 33 184 5 0 0 3 top/left - -;
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-#X floatatom 87 212 5 0 0 3 bottom/center - -;
-#X floatatom 33 230 5 0 0 3 bottom/left - -;
-#X obj 378 152 * -1;
-#X floatatom 378 173 5 0 0 0 - - -;
-#X obj 378 131 - 1;
-#X floatatom 378 235 5 0 0 0 - - -;
-#X floatatom 378 282 5 0 0 0 s:0-vol - #0-vol;
-#X msg 744 294 105 100 1;
-#X obj 378 193 * 0;
-#X text 22 585 manually send 'play stop' messages;
-#X obj 89 553 s CTRL;
-#X obj 239 553 s CTRL;
-#X obj 389 553 s CTRL;
-#X obj 539 553 s CTRL;
-#X text 337 149 still there is issue about non-linearity cut off lower
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-#X floatatom 991 178 5 0 0 0 slider? - -;
-#X floatatom 1051 178 5 0 0 0 - - -;
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-#X text 669 261 bell hitting angle need to be adjusted!;
-#X obj 741 165 sel 1;
-#X text 657 355 gastank head hitter support needed..;
+#X obj 437 34 sel 1;
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 #X connect 19 0 18 1;
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-#X connect 22 0 85 0;
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-#X connect 113 0 111 0;
-#X restore 433 353 pd crickets nanokontrol2;
+#X connect 33 0 20 0;
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+#X connect 35 0 7 0;
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+#X connect 39 0 30 0;
+#X connect 45 0 94 0;
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+#X connect 50 0 96 0;
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+#X text 16 404 NOT USED;
+#X obj 789 419 r NOTE;
+#X obj 789 440 unpack f f f;
+#X text 835 418 /pitch /velocity /onoff;
+#X obj 858 468 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 0
+1;
+#X obj 789 483 spigot;
+#X floatatom 789 546 5 0 0 0 s:0-vol - #0-vol;
+#X text 803 392 volume control;
+#X text 857 497 keys for volume control: vol+ / vol-;
+#N canvas 207 197 551 351 volume 1;
+#X obj 105 160 f;
+#X obj 135 160 +;
+#X obj 105 88 bng 15 250 50 0 empty empty v+ 17 7 0 10 -262144 -1 -1
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+#X obj 152 48 bng 15 250 50 0 empty empty v- 17 7 0 10 -262144 -1 -1
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+#X array \$0-voltable 8 float 3;
+#A 0 10 25 50 100 127 180 255 500;
+#X coords 0 550 8 -50 100 140 1 0 0;
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+#X obj 280 158 f \$0;
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+-1 -1;
+#X obj 277 268 tabread \$0-voltable;
+#X floatatom 277 289 5 0 0 0 - - -;
+#X obj 353 304 print vol;
+#X obj 105 11 inlet;
+#X obj 152 11 inlet;
+#X obj 277 309 outlet;
+#X msg 280 179 \; \$1-voltable 0 10 25 50 100 127 180 255 500;
+#X connect 0 0 1 0;
+#X connect 1 0 0 1;
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+#X connect 2 0 4 0;
+#X connect 3 0 6 0;
+#X connect 4 0 0 0;
+#X connect 4 1 5 0;
+#X connect 5 0 1 1;
+#X connect 6 0 0 0;
+#X connect 6 1 7 0;
+#X connect 7 0 1 1;
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+#X connect 10 0 11 0;
+#X connect 10 1 13 0;
+#X connect 11 0 0 1;
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+#X restore 789 525 pd volume;
+#X obj 789 504 sel 40 38;
 #X connect 0 0 3 0;
 #X connect 2 0 7 1;
 #X connect 3 0 11 0;
@@ -966,3 +1137,11 @@ region stretch range etc.;
 #X connect 96 0 66 0;
 #X connect 97 0 38 0;
 #X connect 99 0 98 0;
+#X connect 104 0 105 0;
+#X connect 105 0 108 0;
+#X connect 105 2 107 0;
+#X connect 107 0 108 1;
+#X connect 108 0 113 0;
+#X connect 112 0 109 0;
+#X connect 113 0 112 0;
+#X connect 113 1 112 1;
diff --git a/sampler/src/main.cpp b/sampler/src/main.cpp
index 8114991..e8e9c49 100644
--- a/sampler/src/main.cpp
+++ b/sampler/src/main.cpp
@@ -18,6 +18,7 @@
 //============<sampler>============
 //optionally pin3 will go HIGH/LOW in sync w/ sound PLAY/STOP
 #define MOTOR_PIN 3
+// #define FAN_ACTION // this is noisy....
 //============</sampler>===========
 
 //HACK: let auto-poweroff speakers stay turned ON! - (creative muvo mini)
@@ -85,8 +86,10 @@ void sample_player_start()
   // if (playSdWav1.isPlaying() == false) {
   playSdWav1.play(filename);
   // }
+#if defined(FAN_ACTION)
   //fan action
   digitalWrite(MOTOR_PIN, HIGH);
+#endif
   //mark the indicator : HIGH: ON
   digitalWrite(13, HIGH);
   //to wait a bit for updating isPlaying()
@@ -114,8 +117,10 @@ void sample_player_stop() {
   //stop the player.
   if (playSdWav1.isPlaying() == true) {
     playSdWav1.stop();
+#if defined(FAN_ACTION)
     //fan stop
     digitalWrite(MOTOR_PIN, LOW);
+#endif
   }
 }
 void sample_player_check() {
@@ -239,8 +244,10 @@ void setup() {
   //  --> use this.. to capture start-up messages, properly. very handy.
 
   //motor
+#if defined(FAN_ACTION)
   pinMode(MOTOR_PIN, OUTPUT);
   digitalWrite(MOTOR_PIN, LOW);
+#endif
 
   //i2c
   Wire.begin(I2C_ADDR);
diff --git a/src/main.cpp b/src/main.cpp
index 94bd5d2..c544912 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -71,11 +71,11 @@
 #define SET_ROOT
 #define SET_CONTAINSROOT
 // (2-1) osc client (non-ROOT)
-#elif 1
+#elif 0
 // #define SET_ROOT
 #define SET_CONTAINSROOT
 // (3) sampler client
-#elif 0
+#elif 1
 #define DISABLE_AP
 #define DISABLE_I2C_REQ
 //