diff --git a/README.md b/README.md
index 1c6c277..7b67165 100644
--- a/README.md
+++ b/README.md
@@ -234,6 +234,14 @@ Work is in progress...
 
 ---
 ## Version history
+### 0.9.434
+- fixed the issue with exiting Screensaver Blank Screen mode via button presses and IR commands.
+- reduced the minimum frequency for tone control on I2S modules to 80Hz.
+- increased the display update task delay to 10 TICKS.
+  to revert to the previous setting, add `#define DSP_TASK_DELAY 2` to `myoptions.h`.
+- when ENCODER2 is connected, the UP and DOWN buttons now work as PREV and NEXT (single click).
+- implemented backlight off in Screensaver Blank Screen mode.
+
 ### 0.9.428
 - fixed freezing after SD scanning during playback
 - AsyncWebSocket queue increased to 128
diff --git a/yoRadio/src/audioI2S/Audio.cpp b/yoRadio/src/audioI2S/Audio.cpp
index 42dbebd..8e82bfe 100644
--- a/yoRadio/src/audioI2S/Audio.cpp
+++ b/yoRadio/src/audioI2S/Audio.cpp
@@ -4733,7 +4733,7 @@ void Audio::IIR_calculateCoefficients(int8_t G0, int8_t G1, int8_t G2){  // Infi
     if(G2 < -40) G2 = -40;
     if(G2 > 6) G2 = 6;
 
-    const float FcLS   =  500;  // Frequency LowShelf[Hz]
+    const float FcLS   =   80;  // Frequency LowShelf[Hz] //500
     const float FcPKEQ = 3000;  // Frequency PeakEQ[Hz]
     const float FcHS   = 6000;  // Frequency HighShelf[Hz]
 
diff --git a/yoRadio/src/core/config.cpp b/yoRadio/src/core/config.cpp
index e1b2033..0f1cfdc 100644
--- a/yoRadio/src/core/config.cpp
+++ b/yoRadio/src/core/config.cpp
@@ -727,9 +727,11 @@ void Config::setBrightness(bool dosave){
 #endif
 }
 
-void Config::setDspOn(bool dspon){
-  store.dspon = dspon;
-  saveValue(&store.dspon, store.dspon, true, true);
+void Config::setDspOn(bool dspon, bool saveval){
+  if(saveval){
+    store.dspon = dspon;
+    saveValue(&store.dspon, store.dspon, true, true);
+  }
 #ifdef USE_NEXTION
   if(!dspon) nextion.sleep();
   else nextion.wake();
diff --git a/yoRadio/src/core/config.h b/yoRadio/src/core/config.h
index d9e1787..74bf37c 100644
--- a/yoRadio/src/core/config.h
+++ b/yoRadio/src/core/config.h
@@ -233,7 +233,7 @@ class Config {
     void setTimezoneOffset(uint16_t tzo);
     uint16_t getTimezoneOffset();
     void setBrightness(bool dosave=false);
-    void setDspOn(bool dspon);
+    void setDspOn(bool dspon, bool saveval = true);
     void sleepForAfter(uint16_t sleepfor, uint16_t sleepafter=0);
     void bootInfo();
     void doSleepW();
diff --git a/yoRadio/src/core/controls.cpp b/yoRadio/src/core/controls.cpp
index 5c00c73..fb82302 100644
--- a/yoRadio/src/core/controls.cpp
+++ b/yoRadio/src/core/controls.cpp
@@ -256,7 +256,7 @@ void irLoop() {
         if(config.ircodes.irVals[target][j]==irResults.value){
           if (network.status != CONNECTED && network.status!=SDREADY && target!=IR_AST) return;
           if(target!=IR_AST && display.mode()==LOST) return;
-          if (display.mode() == SCREENSAVER) {
+          if (display.mode() == SCREENSAVER || display.mode() == SCREENBLANK) {
             display.putRequest(NEWMODE, PLAYER);
             return;
           }
@@ -491,7 +491,7 @@ void onBtnClick(int id) {
         if (display.mode() == PLAYER) {
           player.toggle();
         }
-        if (display.mode() == SCREENSAVER) {
+        if (display.mode() == SCREENSAVER || display.mode() == SCREENBLANK) {
           display.putRequest(NEWMODE, PLAYER);
           #ifdef DSP_LCD
             delay(200);
@@ -525,7 +525,7 @@ void onBtnClick(int id) {
           }
         } else {
           if (display.mode() == PLAYER) {
-            if(config.store.skipPlaylistUpDown){
+            if(config.store.skipPlaylistUpDown || ENC2_BTNL!=255){
               if (id == EVT_BTNUP) {
                 player.prev();
               } else {
@@ -552,7 +552,7 @@ void onBtnClick(int id) {
 }
 
 void onBtnDoubleClick(int id) {
-  if (display.mode() == SCREENSAVER) {
+  if (display.mode() == SCREENSAVER || display.mode() == SCREENBLANK) {
     display.putRequest(NEWMODE, PLAYER);
     return;
   }
diff --git a/yoRadio/src/core/display.cpp b/yoRadio/src/core/display.cpp
index b8d7d80..bba7421 100644
--- a/yoRadio/src/core/display.cpp
+++ b/yoRadio/src/core/display.cpp
@@ -26,7 +26,7 @@ Page *pages[] = { new Page(), new Page(), new Page(), new Page() };
   #define CORE_STACK_SIZE  1024*3
 #endif
 #ifndef DSP_TASK_DELAY
-  #define DSP_TASK_DELAY  2
+  #define DSP_TASK_DELAY  pdMS_TO_TICKS(10)
 #endif
 #if !((DSP_MODEL==DSP_ST7735 && DTYPE==INITR_BLACKTAB) || DSP_MODEL==DSP_ST7789 || DSP_MODEL==DSP_ST7796 || DSP_MODEL==DSP_ILI9488 || DSP_MODEL==DSP_ILI9486 || DSP_MODEL==DSP_ILI9341 || DSP_MODEL==DSP_ILI9225)
   #undef  BITRATE_FULL
@@ -285,12 +285,16 @@ void Display::_swichMode(displayMode_e newmode) {
     _nums.setText("");
     config.isScreensaver = false;
     _pager.setPage( pages[PG_PLAYER]);
+    config.setDspOn(config.store.dspon, false);
     pm.on_display_player();
   }
   if (newmode == SCREENSAVER || newmode == SCREENBLANK) {
     config.isScreensaver = true;
     _pager.setPage( pages[PG_SCREENSAVER]);
-    if (newmode == SCREENBLANK) dsp.clearClock();
+    if (newmode == SCREENBLANK) {
+      dsp.clearClock();
+      config.setDspOn(false, false);
+    }
   }else{
     config.screensaverTicks=SCREENSAVERSTARTUPDELAY;
     config.screensaverPlayingTicks=SCREENSAVERSTARTUPDELAY;
diff --git a/yoRadio/src/core/options.h b/yoRadio/src/core/options.h
index bf2a78a..4a909df 100644
--- a/yoRadio/src/core/options.h
+++ b/yoRadio/src/core/options.h
@@ -1,7 +1,7 @@
 #ifndef options_h
 #define options_h
 
-#define YOVERSION "0.9.428"
+#define YOVERSION "0.9.434"
 
 /*******************************************************
 DO NOT EDIT THIS FILE.