diff --git a/@postman/src/main.cpp b/@postman/src/main.cpp
index 5e59424..8bd29ff 100644
--- a/@postman/src/main.cpp
+++ b/@postman/src/main.cpp
@@ -22,7 +22,7 @@
 
 //============<identities>============
 //
-#define MY_GROUP_ID   (5000)
+#define MY_GROUP_ID   (10000)
 #define MY_ID         (MY_GROUP_ID + 1)
 #define MY_SIGN       ("@POSTMAN|@SAMPLER")
 //
diff --git a/@sampler/src/main.cpp b/@sampler/src/main.cpp
index 21255a9..1506d8a 100644
--- a/@sampler/src/main.cpp
+++ b/@sampler/src/main.cpp
@@ -12,14 +12,6 @@
 // (part-3) teensy35 : 'client:sampler' (mesh post --> play sounds)
 //
 
-//============<sampler>============
-//optionally pin3 will go HIGH/LOW in sync w/ sound PLAY/STOP
-#define MOTOR_PIN 3
-// #define FAN_ACTION // this is noisy.... ==> not so recommendable..
-#define NOTE_MIN 24
-#define NOTE_MAX 84
-//============</sampler>===========
-
 //HACK: let auto-poweroff speakers stay turned ON! - (creative muvo mini)
 #define IDLE_FREQ 22000
 #define IDLE_AMP 0 // --> creative muvo 2 doesn't need this. they just stay on!
@@ -32,11 +24,6 @@
 SdFatSdioEX SD;
 #include <SerialFlash.h>
 
-//teensy 3.5 with SD card
-#define SDCARD_CS_PIN    BUILTIN_SDCARD
-#define SDCARD_MOSI_PIN  11  // not actually used
-#define SDCARD_SCK_PIN   13  // not actually used
-
 // GUItool: begin automatically generated code
 AudioPlaySdWav playSdWav1;               //xy=224,265
 AudioSynthWaveformSine sine1;            //xy=236,361
@@ -81,14 +68,7 @@ void sample_player_start()
     return;
   }
   //start the player!
-  //NOTE: block out 're-triggering'
-  // 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()
@@ -116,10 +96,6 @@ 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() {
@@ -135,8 +111,8 @@ void sample_player_check() {
   }
 }
 //
-Task sample_player_start_task(0, TASK_ONCE, sample_player_start);
-Task sample_player_stop_task(0, TASK_ONCE, sample_player_stop);
+Task sample_player_start_task(0, TASK_ONCE, sample_player_start, &runner, false);
+Task sample_player_stop_task(0, TASK_ONCE, sample_player_stop, &runner, false);
 Task sample_player_check_task(0, TASK_FOREVER, sample_player_check, &runner, true);
 
 //i2c
@@ -183,22 +159,23 @@ void receiveEvent(int numBytes) {
 
     //
     int key = str_key.toInt();
-    if (key >= NOTE_MIN && key <= NOTE_MAX) {
-      sample_now = key;
-      //
-      int velocity = str_velocity.toInt(); // 0 ~ 127
-      float amp_gain = (float)velocity / 127.0;
-      amp1.gain(amp_gain);
-      amp2.gain(amp_gain);
-      //
-      int gate = str_gate.toInt();
-      if (gate == 0) {
-        sample_player_stop_task.restart();
-        Serial.println("sample_player_stop_task");
-      } else {
-        sample_player_start_task.restart();
-        Serial.println("sample_player_start_task");
-      }
+    sample_now = key;
+    //
+    int velocity = str_velocity.toInt();   // 0 ~ 127
+    float amp_gain = (float)velocity / 127.0;
+    //
+    amp_gain = amp_gain * 0.7; // additional amp down. * 70%
+    //
+    amp1.gain(amp_gain);
+    amp2.gain(amp_gain);
+    //
+    int gate = str_gate.toInt();
+    if (gate == 0) {
+      sample_player_stop_task.restart();
+      Serial.println("sample_player_stop_task");
+    } else {
+      sample_player_start_task.restart();
+      Serial.println("sample_player_start_task");
     }
   }
 }
@@ -242,13 +219,7 @@ void setup() {
   // w/o ==> get killed by watchdog.. :(
   //
   // while (!Serial) {}
-  //  --> use this.. to capture start-up messages, properly. very handy.
-
-  //motor
-#if defined(FAN_ACTION)
-  pinMode(MOTOR_PIN, OUTPUT);
-  digitalWrite(MOTOR_PIN, LOW);
-#endif
+  //  --> enable this.. to use Serial. otherwise, very jerky/unstable..
 
   //i2c
   Wire.begin(I2C_ADDR);
@@ -269,10 +240,13 @@ void setup() {
 
   //audio
   AudioMemory(20);
-#if !defined(TEENSY36)
-  //NOTE!! teensy36 board.. output broken? .. so disable this for teensy36.. this is the cause??
-  dacs1.analogReference(EXTERNAL);
-#endif
+
+  // dacs1.analogReference(EXTERNAL);
+  // <-- this was used probably to make output swing greater Vpp == 3.3v
+  //     but, with this + small headphones, i cannot hear anything.
+  //     and, this might be dangerous in some case -> this is suspicous of 1 broken teensy 3.6
+  //     so, unless you are so sure, don't enable this.
+
   mixer1.gain(0,1.0);
   mixer1.gain(1,1.0);
   mixer1.gain(2,0);
@@ -291,10 +265,6 @@ void setup() {
   pinMode(13, OUTPUT);
   digitalWrite(13, LOW); // LOW: OFF
 
-  //player task
-  runner.addTask(sample_player_start_task);
-  runner.addTask(sample_player_stop_task);
-
   //
   Serial.println("[setup] done.");
 }
diff --git a/post.h b/post.h
index 726a413..e65dceb 100644
--- a/post.h
+++ b/post.h
@@ -117,6 +117,8 @@ struct AddressLibrary {
       book.add(Address(0xAC, 0x67, 0xB2, 0x0B, 0xAD, 0xB0, "audioooo #2")); //WROOM
       book.add(Address(0xA8, 0x03, 0x2A, 0x6C, 0x88, 0x78, "audioooo #3")); //WROVER
       //
+      book.add(Address(0x98, 0xF4, 0xAB, 0xB3, 0xB4, 0xDD, "sampler #1")); //TEENSY+ESP8266
+      //
       lib.push_back(book);
     }
   }