diff --git a/@bell/platformio.ini b/@bell/platformio.ini
index 82bcb25..a2d1d62 100644
--- a/@bell/platformio.ini
+++ b/@bell/platformio.ini
@@ -1,30 +1,45 @@
+; < NOTE >
+
+; to enable verbose output add option -->
+; $ platformio run --verbose
+
+; to make this permanent for the proj. -->
+; $ platformio settings set force_verbose Yes
+
+; then confirm the change -->
+; $ platformio settings get
+
+
+; // pio v 4.0 'Build options'
+;    - build_type
+;    - build_flags
+;    - src_build_flags
+;    - build_unflags
+;    - src_filter
+;    - targets
+
+
 [platformio]
 default_envs = nodemcuv2
 
 [env]
 framework = arduino
-upload_speed = 921600
 upload_port =
   /dev/ttyUSB0
   /dev/tty.SLAB_USBtoUART
 lib_deps =
-  SPI
-  Wire
-  64 ; ArduinoJson
-  1269 ; Painless Mesh
+  721 ; TaskScheduler
 
 [env:nodemcuv2]
 platform = espressif8266
 board = nodemcuv2
 lib_deps =
   ${env.lib_deps}
-  ESP8266WiFi
-  Servo(esp8266)
+upload_speed = 921600 ; 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600
 
-[env:huzzah]
+[env:d1_mini_pro]
 platform = espressif8266
-board = huzzah
+board = d1_mini_pro
 lib_deps =
   ${env.lib_deps}
-  ESP8266WiFi
-  Servo(esp8266)
+upload_speed = 460800 ; 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600
diff --git a/@bell/src/main.cpp b/@bell/src/main.cpp
index 4782024..09b123a 100644
--- a/@bell/src/main.cpp
+++ b/@bell/src/main.cpp
@@ -46,114 +46,47 @@
 //============</gastank>===========
 
 //============<parameters>============
-#define MESH_SSID "forest-all/around"
-#define MESH_PASSWORD "cc*vvvv/kkk"
-#define MESH_PORT 5555
-#define MESH_CHANNEL 5
-#define LONELY_TO_DIE    (1000)
-//============</parameters>===========
-
 //
-// LED status indication
-// phase 0
-//    - LED => steady on
-//    - booted. and running. no connection. scanning.
-// phase 1
-//    - LED => slow blinking (syncronized)
-//    - + connected.
-//
-#if defined(ARDUINO_ESP8266_NODEMCU) // nodemcuv2
-#define LED_PIN 2
-#elif defined(ARDUINO_ESP8266_ESP12) // huzzah
-#define LED_PIN 2
-#elif defined(ARDUINO_FEATHER_ESP32) // featheresp32
-#define LED_PIN 13
-#elif defined(ARDUINO_NodeMCU_32S) // nodemcu-32s
-#define LED_PIN 2
-#endif
-#define LED_PERIOD (1111)
+#define LED_PERIOD (11111)
 #define LED_ONTIME (1)
+#define LED_GAPTIME (222)
+//
+#define WIFI_CHANNEL 5
+//
+// 'MONITORING_SERIAL'
+//
+// --> sometimes, the 'Serial' is in use (for example, 'osc' node)
+//     then,      use 'Serial1' - D4/GPIO2/TDX1 @ nodemcu (this is TX only.)
+//
+// --> otherwise, MONITORING_SERIAL == Serial.
+//
+#if defined(SERIAL_SWAP)
+#define MONITORING_SERIAL (Serial1)
+#else
+#define MONITORING_SERIAL (Serial)
+#endif
+//
+//============</parameters>===========
 
 //arduino
 #include <Arduino.h>
 
-//i2c
-#include <Wire.h>
+//post & addresses
 #include "../../post.h"
 
-//painlessmesh
-#include <painlessMesh.h>
-painlessMesh mesh;
+//espnow
+#include <ESP8266WiFi.h>
+#include <espnow.h>
 
-//scheduler
+//task
+#include <TaskScheduler.h>
 Scheduler runner;
 
-//task #0 : connection indicator
-bool onFlag = false;
-bool isConnected = false;
-//prototypes
-void taskStatusBlink_steadyOn();
-void taskStatusBlink_slowblink_insync();
-void taskStatusBlink_steadyOff();
-//the task
-Task statusblinks(0, 1, &taskStatusBlink_steadyOn); // at start, steady on. default == disabled. ==> setup() will enable.
-// when disconnected, and trying, steadyon.
-void taskStatusBlink_steadyOn() {
-  onFlag = true;
-}
-// when connected, blink per 1s. sync-ed. (== default configuration)
-void taskStatusBlink_slowblink_insync() {
-  // toggler
-  onFlag = !onFlag;
-  // on-time
-  statusblinks.delay(LED_ONTIME);
-  // re-enable & sync.
-  if (statusblinks.isLastIteration()) {
-    statusblinks.setIterations(2); //refill iteration counts
-    statusblinks.enableDelayed(LED_PERIOD - (mesh.getNodeTime() % (LED_PERIOD*1000))/1000); //re-enable with sync-ed delay
-  }
-}
-// when connected, steadyoff. (== alternative configuration)
-void taskStatusBlink_steadyOff() {
-  onFlag = false;
-}
-
-//task #1 : happy or lonely
-//   --> automatic reset after some time of 'loneliness (disconnected from any node)'
-void nothappyalone() {
-  static bool isConnected_prev = false;
-  static unsigned long lonely_time_start = 0;
-  // oh.. i m lost the signal(==connection)
-  if (isConnected_prev != isConnected && isConnected == false) {
-    lonely_time_start = millis();
-    Serial.println("oh.. i m lost!");
-  }
-  // .... how long we've been lonely?
-  if (isConnected == false) {
-    if (millis() - lonely_time_start > LONELY_TO_DIE) {
-      // okay. i m fed up. bye the world.
-      Serial.println("okay. i m fed up. bye the world.");
-      Serial.println();
-#if defined(ESP8266)
-      ESP.reset();
-#elif defined(ESP32)
-      ESP.restart();
-      // esp32 doesn't support 'reset()' yet...
-      // (restart() is framework-supported, reset() is more forced hardware-reset-action)
-#else
-#error unknown esp.
-#endif
-    }
-  }
-  //
-  isConnected_prev = isConnected;
-}
-// Task nothappyalone_task(1000, TASK_FOREVER, &nothappyalone, &runner, true); // by default, ENABLED.
-Task nothappyalone_task(100, TASK_FOREVER, &nothappyalone); // by default, ENABLED.
-
+//-*-*-*-*-*-*-*-*-*-*-*-*-
 // servo
-#define SERVO_PIN D6
 #include <Servo.h>
+
+#define SERVO_PIN D6
 Servo myservo;
 // #define HITTING_ANGLE 87
 #define HITTING_ANGLE 90
diff --git a/crickets/src/main.cpp b/crickets/src/main.cpp
index 2c03dfc..1ec1fe7 100755
--- a/crickets/src/main.cpp
+++ b/crickets/src/main.cpp
@@ -21,7 +21,7 @@
 //============<identities>============
 //
 #define MY_GROUP_ID   (3000)
-#define MY_ID         (MY_GROUP_ID + 789)
+#define MY_ID         (MY_GROUP_ID + 122)
 #define MY_SIGN       ("CRICKET")
 //
 //============</identities>============
diff --git a/puredata/radio_toner.pd b/puredata/radio_toner.pd
index 5700012..0a80eae 100644
--- a/puredata/radio_toner.pd
+++ b/puredata/radio_toner.pd
@@ -1,5 +1,5 @@
-#N canvas 437 95 568 438 12;
-#N canvas 78 143 1133 383 roundly 1;
+#N canvas 642 89 797 725 12;
+#N canvas 200 472 1133 383 roundly 0;
 #X msg 364 139 \$1 5000;
 #X obj 364 162 unpack f f;
 #X obj 364 185 s X1;
@@ -7,16 +7,16 @@
 #X obj 54 208 r HELLO;
 #X obj 54 254 unpack f f f f;
 #X floatatom 85 283 5 0 0 0 - - -;
-#X obj 107 311 hsl 1000 15 -50000 50000 0 0 empty empty empty -2 -8
-0 10 -260097 -262144 -1 0 1;
-#X obj 107 331 hsl 1000 15 -50000 50000 0 0 empty empty empty -2 -8
-0 10 -13381 -262144 -1 0 1;
+#X obj 107 311 hsl 1000 15 -500000 500000 0 0 empty empty empty -2
+-8 0 10 -260097 -262144 -1 0 1;
+#X obj 107 331 hsl 1000 15 -500000 500000 0 0 empty empty empty -2
+-8 0 10 -13381 -262144 -1 0 1;
 #X obj 164 254 unpack f f f f;
 #X floatatom 195 283 5 0 0 0 - - -;
 #X floatatom 263 99 5 0 0 0 target_pos - -;
-#X obj 107 31 hsl 1000 15 -50000 50000 0 0 empty empty empty -2 -8
+#X obj 107 31 hsl 1000 15 -500000 500000 0 0 empty empty empty -2 -8
 0 10 -260097 -262144 -1 49950 1;
-#X obj 107 51 hsl 1000 15 -50000 50000 0 0 empty empty empty -2 -8
+#X obj 107 51 hsl 1000 15 -500000 500000 0 0 empty empty empty -2 -8
 0 10 -13381 -262144 -1 49950 1;
 #X obj 263 121 t b a;
 #X msg 714 139 \$1 5000;
@@ -96,17 +96,81 @@
 #X obj 222 204 metro 2000;
 #X obj 62 343 s NOTE;
 #X obj 222 343 s NOTE;
-#X obj 222 238 riff 200 3001;
 #X msg 127 157 symbol riff10;
 #X msg 287 157 symbol riff11;
 #X obj 62 238 riff 170 3120;
+#N canvas 0 23 450 278 (subpatch) 0;
+#X array riff13 10 float 3;
+#A 0 -0.380956 0.752384 0.819052 0.619048 1.00953 0.761905 0.609524
+0.657143 0.419048 0.809528;
+#X coords 0 1 10 0 150 105 1 0 0;
+#X restore 412 136 graph;
+#X obj 412 284 tgl 20 0 empty empty empty 17 7 0 10 -262130 -1 -1 0
+1;
+#X obj 536 304 tgl 20 0 empty empty empty 17 7 0 10 -257985 -1 -1 0
+1;
+#X obj 412 309 metro 2000;
+#X obj 412 448 s NOTE;
+#X obj 412 343 riff 600 3791;
+#X msg 479 255 symbol riff10;
+#N canvas 0 23 450 278 (subpatch) 0;
+#X array riff12 10 float 3;
+#A 0 0.4 0.133332 -0.180956 0.142857 -0.257145 0.295238 0.104762 -0.161906
+-0.361908 0.466668;
+#X coords 0 1 10 0 150 105 1 0 0;
+#X restore 593 140 graph;
+#X obj 593 288 tgl 20 0 empty empty empty 17 7 0 10 -262130 -1 -1 0
+1;
+#X obj 717 308 tgl 20 0 empty empty empty 17 7 0 10 -257985 -1 -1 0
+1;
+#X obj 593 313 metro 2000;
+#X obj 593 452 s NOTE;
+#X msg 660 259 symbol riff10;
+#X msg 469 276 symbol riff13;
+#X msg 650 280 symbol riff12;
+#X obj 56 390 radio_bongbong;
+#X obj 593 347 riff 600 4200;
+#X obj 222 238 riff 200 3791;
+#N canvas 0 23 450 278 (subpatch) 0;
+#X array riff22 10 float 3;
+#A 0 -0.161907 0.104762 -0.257147 0.304763 0.190476 -0.285718 0.390476
+-0.371432 0.323809 -0.238097;
+#X coords 0 1 10 0 150 105 1 0 0;
+#X restore 389 502 graph;
+#X obj 389 650 tgl 20 0 empty empty empty 17 7 0 10 -262130 -1 -1 0
+1;
+#X obj 513 670 tgl 20 0 empty empty empty 17 7 0 10 -257985 -1 -1 0
+1;
+#X obj 389 675 metro 2000;
+#X obj 389 814 s NOTE;
+#X msg 456 621 symbol riff10;
+#X obj 389 709 riff 600 4203;
+#X msg 446 642 symbol riff22;
 #X connect 3 0 5 0;
-#X connect 4 0 14 3;
-#X connect 5 0 14 0;
+#X connect 4 0 13 3;
+#X connect 5 0 13 0;
 #X connect 6 0 8 0;
-#X connect 7 0 11 3;
-#X connect 8 0 11 0;
-#X connect 11 0 10 0;
-#X connect 12 0 14 1;
-#X connect 13 0 11 1;
-#X connect 14 0 9 0;
+#X connect 7 0 31 3;
+#X connect 8 0 31 0;
+#X connect 11 0 13 1;
+#X connect 12 0 31 1;
+#X connect 13 0 9 0;
+#X connect 15 0 17 0;
+#X connect 16 0 19 3;
+#X connect 17 0 19 0;
+#X connect 19 0 18 0;
+#X connect 20 0 19 1;
+#X connect 22 0 24 0;
+#X connect 23 0 30 3;
+#X connect 24 0 30 0;
+#X connect 26 0 30 1;
+#X connect 27 0 19 1;
+#X connect 28 0 30 1;
+#X connect 30 0 25 0;
+#X connect 31 0 10 0;
+#X connect 33 0 35 0;
+#X connect 34 0 38 3;
+#X connect 35 0 38 0;
+#X connect 37 0 38 1;
+#X connect 38 0 36 0;
+#X connect 39 0 38 1;
diff --git a/roller/src/main.cpp b/roller/src/main.cpp
index 511b638..8174dee 100644
--- a/roller/src/main.cpp
+++ b/roller/src/main.cpp
@@ -21,7 +21,7 @@
 //============<identities>============
 //
 #define MY_GROUP_ID   (4000)
-#define MY_ID         (MY_GROUP_ID + 100)
+#define MY_ID         (MY_GROUP_ID + 200)
 #define MY_SIGN       ("ROLLER")
 //
 //============</identities>============