diff --git a/app/src/main/java/com/github/axet/audiorecorder/activities/MainActivity.java b/app/src/main/java/com/github/axet/audiorecorder/activities/MainActivity.java
index bec381b..d5b2a88 100644
--- a/app/src/main/java/com/github/axet/audiorecorder/activities/MainActivity.java
+++ b/app/src/main/java/com/github/axet/audiorecorder/activities/MainActivity.java
@@ -1,7 +1,6 @@
 package com.github.axet.audiorecorder.activities;
 
 import android.Manifest;
-import android.app.ActionBar;
 import android.app.AlertDialog;
 import android.content.Context;
 import android.content.DialogInterface;
@@ -9,8 +8,8 @@ import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
 import android.content.res.Configuration;
-import android.content.res.Resources;
-import android.graphics.Color;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
 import android.graphics.drawable.ColorDrawable;
 import android.media.MediaPlayer;
 import android.net.Uri;
@@ -39,14 +38,15 @@ import android.widget.SeekBar;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import com.github.axet.androidlibrary.animations.RemoveItemAnimation;
 import com.github.axet.androidlibrary.widgets.OpenFileDialog;
-import com.github.axet.androidlibrary.widgets.ThemeUtils;
+import com.github.axet.androidlibrary.widgets.PopupShareActionProvider;
 import com.github.axet.audiorecorder.R;
 import com.github.axet.audiorecorder.animations.RecordingAnimation;
-import com.github.axet.androidlibrary.animations.RemoveItemAnimation;
 import com.github.axet.audiorecorder.app.MainApplication;
+import com.github.axet.audiorecorder.app.RawSamples;
 import com.github.axet.audiorecorder.app.Storage;
-import com.github.axet.androidlibrary.widgets.PopupShareActionProvider;
+import com.github.axet.audiorecorder.widgets.PitchView;
 import com.google.android.gms.appindexing.Action;
 import com.google.android.gms.appindexing.AppIndex;
 import com.google.android.gms.common.api.GoogleApiClient;
@@ -638,6 +638,8 @@ public class MainActivity extends AppCompatActivity implements AbsListView.OnScr
     public static final String[] PERMISSIONS = new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE};
 
     boolean permitted(String[] ss) {
+        if (Build.VERSION.SDK_INT < 11)
+            return true;
         for (String s : ss) {
             if (ContextCompat.checkSelfPermission(this, s) != PackageManager.PERMISSION_GRANTED) {
                 return false;
@@ -647,6 +649,8 @@ public class MainActivity extends AppCompatActivity implements AbsListView.OnScr
     }
 
     boolean permitted() {
+        if (Build.VERSION.SDK_INT < 11)
+            return true;
         for (String s : PERMISSIONS) {
             if (ContextCompat.checkSelfPermission(this, s) != PackageManager.PERMISSION_GRANTED) {
                 ActivityCompat.requestPermissions(this, PERMISSIONS, 1);
diff --git a/app/src/main/java/com/github/axet/audiorecorder/activities/RecordingActivity.java b/app/src/main/java/com/github/axet/audiorecorder/activities/RecordingActivity.java
index e1920c7..b4efb2c 100644
--- a/app/src/main/java/com/github/axet/audiorecorder/activities/RecordingActivity.java
+++ b/app/src/main/java/com/github/axet/audiorecorder/activities/RecordingActivity.java
@@ -738,6 +738,8 @@ public class RecordingActivity extends AppCompatActivity {
     };
 
     boolean permitted(String[] ss) {
+        if (Build.VERSION.SDK_INT < 11)
+            return true;
         for (String s : ss) {
             if (ContextCompat.checkSelfPermission(this, s) != PackageManager.PERMISSION_GRANTED) {
                 return false;
@@ -747,6 +749,8 @@ public class RecordingActivity extends AppCompatActivity {
     }
 
     boolean permitted() {
+        if (Build.VERSION.SDK_INT < 11)
+            return true;
         for (String s : PERMISSIONS) {
             if (ContextCompat.checkSelfPermission(this, s) != PackageManager.PERMISSION_GRANTED) {
                 ActivityCompat.requestPermissions(this, PERMISSIONS, 1);
diff --git a/app/src/main/java/com/github/axet/audiorecorder/activities/SettingsActivity.java b/app/src/main/java/com/github/axet/audiorecorder/activities/SettingsActivity.java
index f23ae06..9bb048b 100644
--- a/app/src/main/java/com/github/axet/audiorecorder/activities/SettingsActivity.java
+++ b/app/src/main/java/com/github/axet/audiorecorder/activities/SettingsActivity.java
@@ -208,6 +208,8 @@ public class SettingsActivity extends AppCompatPreferenceActivity implements Sha
     public static final String[] PERMISSIONS = new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE};
 
     public static boolean permitted(Context context, String[] ss) {
+        if (Build.VERSION.SDK_INT < 11)
+            return true;
         for (String s : ss) {
             if (ContextCompat.checkSelfPermission(context, s) != PackageManager.PERMISSION_GRANTED) {
                 return false;
diff --git a/app/src/main/java/com/github/axet/audiorecorder/app/Storage.java b/app/src/main/java/com/github/axet/audiorecorder/app/Storage.java
index 457d351..313a783 100644
--- a/app/src/main/java/com/github/axet/audiorecorder/app/Storage.java
+++ b/app/src/main/java/com/github/axet/audiorecorder/app/Storage.java
@@ -1,7 +1,6 @@
 package com.github.axet.audiorecorder.app;
 
 import android.Manifest;
-import android.content.ContentResolver;
 import android.content.Context;
 import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
@@ -10,13 +9,8 @@ import android.os.Build;
 import android.os.StatFs;
 import android.preference.PreferenceManager;
 import android.support.v4.content.ContextCompat;
-import android.util.Log;
-import android.widget.Toast;
 
 import com.github.axet.audiorecorder.R;
-import com.github.axet.audiorecorder.activities.RecordingActivity;
-import com.github.axet.audiorecorder.encoders.FormatM4A;
-import com.github.axet.audiorecorder.encoders.FormatWAV;
 
 import java.io.File;
 import java.io.FileInputStream;
@@ -42,6 +36,8 @@ public class Storage {
     public static final String[] PERMISSIONS = new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE};
 
     public boolean permitted(String[] ss) {
+        if (Build.VERSION.SDK_INT < 11)
+            return true;
         for (String s : ss) {
             if (ContextCompat.checkSelfPermission(context, s) != PackageManager.PERMISSION_GRANTED) {
                 return false;
@@ -227,7 +223,7 @@ public class Storage {
 
         StatFs fsi = new StatFs(f.getPath());
         if (Build.VERSION.SDK_INT < 18)
-            return fsi.getBlockSize() * fsi.getAvailableBlocks();
+            return fsi.getBlockSize() * (long) fsi.getAvailableBlocks();
         else
             return fsi.getBlockSizeLong() * fsi.getAvailableBlocksLong();
     }
diff --git a/app/src/main/java/com/github/axet/audiorecorder/widgets/PitchView.java b/app/src/main/java/com/github/axet/audiorecorder/widgets/PitchView.java
index 01456b3..43ce578 100644
--- a/app/src/main/java/com/github/axet/audiorecorder/widgets/PitchView.java
+++ b/app/src/main/java/com/github/axet/audiorecorder/widgets/PitchView.java
@@ -1,24 +1,18 @@
 package com.github.axet.audiorecorder.widgets;
 
 import android.content.Context;
-import android.content.res.Resources;
-import android.content.res.TypedArray;
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Paint;
 import android.graphics.Rect;
-import android.os.Build;
 import android.os.Handler;
 import android.util.AttributeSet;
 import android.util.Log;
-import android.util.TypedValue;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.TextView;
 
 import com.github.axet.androidlibrary.widgets.ThemeUtils;
 import com.github.axet.audiorecorder.R;
-import com.github.axet.audiorecorder.app.MainApplication;
 import com.github.axet.audiorecorder.app.RawSamples;
 
 import java.util.LinkedList;
@@ -83,8 +77,7 @@ public class PitchView extends ViewGroup {
         Handler handler;
         Runnable run;
 
-        public static HandlerUpdate start(Handler handler, Runnable run, long updateSpeed) {
-            HandlerUpdate r = new HandlerUpdate();
+        public static HandlerUpdate start(HandlerUpdate r, Handler handler, Runnable run, long updateSpeed) {
             r.run = run;
             r.start = System.currentTimeMillis();
             r.updateSpeed = updateSpeed;
@@ -94,14 +87,18 @@ public class PitchView extends ViewGroup {
             return r;
         }
 
+        public static HandlerUpdate start(Handler handler, Runnable run, long updateSpeed) {
+            HandlerUpdate r = new HandlerUpdate();
+            return start(r, handler, run, updateSpeed);
+        }
+
+
         public static void stop(Handler handler, Runnable run) {
             handler.removeCallbacks(run);
         }
 
         @Override
         public void run() {
-            this.run.run();
-
             long cur = System.currentTimeMillis();
 
             long diff = cur - start;
@@ -112,6 +109,40 @@ public class PitchView extends ViewGroup {
             if (delay > updateSpeed)
                 delay = updateSpeed;
 
+            post(delay);
+        }
+
+        void post(long delay) {
+            this.run.run();
+
+            if (delay > 0)
+                this.handler.postDelayed(this, delay);
+            else
+                this.handler.post(this);
+        }
+    }
+
+    // if CPU speed not enough skip frames
+    public static class FallbackUpdate extends HandlerUpdate {
+        Runnable fallback;
+        long slow;
+
+        public static FallbackUpdate start(Handler handler, Runnable run, Runnable fallback, long updateSpeed) {
+            FallbackUpdate r = new FallbackUpdate();
+            r.fallback = fallback;
+            r.slow = updateSpeed / 4;
+            return (FallbackUpdate) start(r, handler, run, updateSpeed);
+        }
+
+        @Override
+        void post(long delay) {
+            if (delay < slow) {
+                Log.d(TAG, "fallback " + delay + " " + slow);
+                this.fallback.run();
+            } else {
+                Log.d(TAG, "run " + delay + " " + slow);
+                this.run.run();
+            }
             if (delay > 0)
                 this.handler.postDelayed(this, delay);
             else
@@ -421,11 +452,12 @@ public class PitchView extends ViewGroup {
     }
 
     public void fit(int max) {
+        if (max < 0) // -1
+            return;
         if (data.size() > max) {
             int cut = data.size() - max;
             data.subList(0, cut).clear();
             samples += cut;
-
             int m = data.size() - 1;
             // screen rotate may cause play/edit offsets off screen
             if (editPos > m)
@@ -571,13 +603,18 @@ public class PitchView extends ViewGroup {
     public void edit() {
         if (edit == null) {
             editFlash = true;
-
-            edit = HandlerUpdate.start(handler, new Runnable() {
+            edit = FallbackUpdate.start(handler, new Runnable() {
                 @Override
                 public void run() {
                     draw();
                     editFlash = !editFlash;
                 }
+            }, new Runnable() {
+                @Override
+                public void run() {
+                    graph.calc();
+                    editFlash = !editFlash;
+                }
             }, EDIT_UPDATE_SPEED);
         }
     }
@@ -595,12 +632,16 @@ public class PitchView extends ViewGroup {
 
         if (draw == null) {
             time = System.currentTimeMillis();
-
-            draw = HandlerUpdate.start(handler, new Runnable() {
+            draw = FallbackUpdate.start(handler, new Runnable() {
                 @Override
                 public void run() {
                     drawCalc();
                 }
+            }, new Runnable() {
+                @Override
+                public void run() {
+                    graph.calc();
+                }
             }, UPDATE_SPEED);
         }
     }
@@ -638,11 +679,16 @@ public class PitchView extends ViewGroup {
 
         if (play == null) {
             time = System.currentTimeMillis();
-            play = HandlerUpdate.start(handler, new Runnable() {
+            play = FallbackUpdate.start(handler, new Runnable() {
                 @Override
                 public void run() {
                     draw();
                 }
+            }, new Runnable() {
+                @Override
+                public void run() {
+                    graph.calc();
+                }
             }, UPDATE_SPEED);
         }
     }
diff --git a/app/src/main/res/layout/recording.xml b/app/src/main/res/layout/recording.xml
index a470301..39c9e40 100644
--- a/app/src/main/res/layout/recording.xml
+++ b/app/src/main/res/layout/recording.xml
@@ -123,7 +123,7 @@
                         android:src="@drawable/play"
                         android:tint="?attr/colorAccent" />
 
-                    <Space
+                    <View
                         android:layout_weight="1"
                         android:layout_width="wrap_content"
                         android:layout_height="wrap_content" />
@@ -135,7 +135,7 @@
                         android:src="@drawable/ic_create_black_24dp"
                         android:tint="?attr/colorAccent" />
 
-                    <Space
+                    <View
                         android:layout_weight="1"
                         android:layout_width="wrap_content"
                         android:layout_height="wrap_content" />
@@ -148,7 +148,7 @@
                         android:src="@drawable/share"
                         android:tint="?attr/colorAccent" />
 
-                    <Space
+                    <View
                         android:layout_weight="1"
                         android:layout_width="wrap_content"
                         android:layout_height="wrap_content" />
diff --git a/app/src/main/res/values-ru/strings.xml b/app/src/main/res/values-ru/strings.xml
index 974634f..7b85bf3 100644
--- a/app/src/main/res/values-ru/strings.xml
+++ b/app/src/main/res/values-ru/strings.xml
@@ -61,23 +61,27 @@
         <item quantity="one">%d день</item>
         <item quantity="few">%d дня </item>
         <item quantity="many">%d дней</item>
+        <item quantity="other">%d дней</item>
     </plurals>
 
     <plurals name="hours">
         <item quantity="one">%d час</item>
         <item quantity="few">%d часа</item>
         <item quantity="many">%d часов</item>
+        <item quantity="other">%d часов</item>
     </plurals>
 
     <plurals name="minutes">
         <item quantity="one">%d минута</item>
         <item quantity="few">%d минуты</item>
         <item quantity="many">%d минут</item>
+        <item quantity="other">%d минут</item>
     </plurals>
 
     <plurals name="seconds">
         <item quantity="one">%d секунда</item>
         <item quantity="few">%d секунды</item>
         <item quantity="many">%d секунд</item>
+        <item quantity="other">%d секунд</item>
     </plurals>
 </resources>