diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index c0fe91f..c95d834 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,14 +1,15 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+<manifest xmlns:tools="http://schemas.android.com/tools"
+    xmlns:android="http://schemas.android.com/apk/res/android">
 
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.RECORD_AUDIO" />
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+    <uses-permission android:name="android.permission.WRITE_SETTINGS"
+        tools:ignore="ProtectedPermissions" />
 
     <application
         android:allowBackup="true"
-        android:dataExtractionRules="@xml/data_extraction_rules"
-        android:fullBackupContent="@xml/backup_rules"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
diff --git a/app/src/main/java/net/mezimmah/wkt9/WKT9.kt b/app/src/main/java/net/mezimmah/wkt9/WKT9.kt
index a1c3e91..73aa883 100644
--- a/app/src/main/java/net/mezimmah/wkt9/WKT9.kt
+++ b/app/src/main/java/net/mezimmah/wkt9/WKT9.kt
@@ -3,7 +3,10 @@ package net.mezimmah.wkt9
 import android.annotation.SuppressLint
 import android.content.Intent
 import android.inputmethodservice.InputMethodService
+import android.media.AudioManager
 import android.media.MediaRecorder
+import android.net.Uri
+import android.provider.Settings
 import android.text.InputType
 import android.util.Log
 import android.view.KeyEvent
@@ -26,14 +29,14 @@ import kotlinx.coroutines.launch
 import net.mezimmah.wkt9.dao.SettingDao
 import net.mezimmah.wkt9.dao.WordDao
 import net.mezimmah.wkt9.db.AppDatabase
-import net.mezimmah.wkt9.inputmode.InputMode
 import net.mezimmah.wkt9.inputmode.AlphaInputMode
 import net.mezimmah.wkt9.inputmode.FNInputMode
 import net.mezimmah.wkt9.inputmode.IdleInputMode
+import net.mezimmah.wkt9.inputmode.InputMode
 import net.mezimmah.wkt9.inputmode.NumericInputMode
 import net.mezimmah.wkt9.inputmode.Status
-import net.mezimmah.wkt9.inputmode.WordInputMode
 import net.mezimmah.wkt9.inputmode.WKT9InputMode
+import net.mezimmah.wkt9.inputmode.WordInputMode
 import net.mezimmah.wkt9.keypad.KeyCodeMapping
 import net.mezimmah.wkt9.keypad.KeyEventResult
 import net.mezimmah.wkt9.keypad.KeyLayout
@@ -42,8 +45,9 @@ import net.mezimmah.wkt9.t9.T9
 import net.mezimmah.wkt9.voice.Whisper
 import okio.IOException
 import java.io.File
-import java.lang.StringBuilder
 import java.util.Locale
+import kotlin.math.floor
+
 
 //val info = arrayOf(TextInfo("banan#", 0, 6, 0, 0))
 //
@@ -310,7 +314,6 @@ class WKT9: InputMethodService(), SpellCheckerSession.SpellCheckerSessionListene
         updateInputStatus()
     }
 
-    // Todo: inputType
     private fun enableInputMode(mode: WKT9InputMode) {
         if (mode != WKT9InputMode.FN) lastInputMode = mode
 
@@ -375,8 +378,6 @@ class WKT9: InputMethodService(), SpellCheckerSession.SpellCheckerSessionListene
             .replace('-', '_')
             .lowercase()
 
-        Log.d(tag, name)
-
         return resources.getIdentifier(name, "drawable", packageName)
     }
 
@@ -421,6 +422,10 @@ class WKT9: InputMethodService(), SpellCheckerSession.SpellCheckerSessionListene
         if (res.focus) onFocus()
         if (res.switchInputMode != null) onSwitchInputMode(res.switchInputMode)
         if (res.functionMode) onFunctionMode()
+        if (res.increaseVolume) onIncreaseVolume()
+        if (res.decreaseVolume) onDecreaseVolume()
+        if (res.increaseBrightness) onIncreaseBrightness()
+        if (res.decreaseBrightness) onDecreaseBrightness()
 
         return res.consumed
     }
@@ -462,6 +467,18 @@ class WKT9: InputMethodService(), SpellCheckerSession.SpellCheckerSessionListene
         return composing
     }
 
+    private fun normalize(
+        x: Float,
+        inMin: Float,
+        inMax: Float,
+        outMin: Float,
+        outMax: Float
+    ): Float {
+        val outRange = outMax - outMin
+        val inRange = inMax - inMin
+        return (x - inMin) * outRange / inRange + outMin
+    }
+
     private fun onCandidates(candidates: List<String>, timeout: Int?) {
         clearCandidates()
 
@@ -500,6 +517,25 @@ class WKT9: InputMethodService(), SpellCheckerSession.SpellCheckerSessionListene
         commitText(text, cursorPosition, cursorPosition)
     }
 
+    private fun onDecreaseBrightness() {
+        if (!Settings.System.canWrite(this)) requestWriteSettings()
+        else {
+            var brightness = Settings.System.getInt(contentResolver, Settings.System.SCREEN_BRIGHTNESS)
+
+            brightness -= 5
+
+            if (brightness < 0) brightness = 0
+
+            Settings.System.putInt(contentResolver, Settings.System.SCREEN_BRIGHTNESS, brightness)
+        }
+    }
+
+    private fun onDecreaseVolume() {
+        val audioManager = getSystemService(AUDIO_SERVICE) as AudioManager
+
+        audioManager.adjustVolume(AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI)
+    }
+
     private fun onDelete(beforeCursor: Int, afterCursor: Int) {
         clearCandidates()
         deleteText(beforeCursor, afterCursor)
@@ -514,6 +550,25 @@ class WKT9: InputMethodService(), SpellCheckerSession.SpellCheckerSessionListene
         updateInputStatus()
     }
 
+    private fun onIncreaseBrightness() {
+        if (!Settings.System.canWrite(this)) requestWriteSettings()
+        else {
+            var brightness = Settings.System.getInt(contentResolver, Settings.System.SCREEN_BRIGHTNESS)
+
+            brightness += 5
+
+            if (brightness > 255) brightness = 255
+
+            Settings.System.putInt(contentResolver, Settings.System.SCREEN_BRIGHTNESS, brightness)
+        }
+    }
+
+    private fun onIncreaseVolume() {
+        val audioManager = getSystemService(AUDIO_SERVICE) as AudioManager
+
+        audioManager.adjustVolume(AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI)
+    }
+
     private fun onIncreaseWeight() {
         val word = commitHistory.last()
 
@@ -655,6 +710,15 @@ class WKT9: InputMethodService(), SpellCheckerSession.SpellCheckerSessionListene
         composeText(candidates[candidateIndex])
     }
 
+    private fun requestWriteSettings() {
+        val intent = Intent(Settings.ACTION_MANAGE_WRITE_SETTINGS)
+
+        intent.data = Uri.parse("package:$packageName")
+        intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
+
+        startActivity(intent)
+    }
+
     private fun updateInputStatus() {
         inputStatus = inputMode?.status ?: Status.CAP
 
diff --git a/app/src/main/java/net/mezimmah/wkt9/inputmode/FNInputMode.kt b/app/src/main/java/net/mezimmah/wkt9/inputmode/FNInputMode.kt
index c63febc..6bcfaca 100644
--- a/app/src/main/java/net/mezimmah/wkt9/inputmode/FNInputMode.kt
+++ b/app/src/main/java/net/mezimmah/wkt9/inputmode/FNInputMode.kt
@@ -1,11 +1,31 @@
 package net.mezimmah.wkt9.inputmode
 
 import android.util.Log
+import net.mezimmah.wkt9.keypad.Command
 import net.mezimmah.wkt9.keypad.Key
+import net.mezimmah.wkt9.keypad.KeyCommandResolver
 import net.mezimmah.wkt9.keypad.KeyEventResult
 
 class FNInputMode: InputMode {
     private val tag = "WKT9"
+    private val parentKeyCommandResolver: KeyCommandResolver = KeyCommandResolver.getBasic()
+    private val keyCommandResolver: KeyCommandResolver = KeyCommandResolver(
+        parent = parentKeyCommandResolver,
+
+        onShort = HashMap(mapOf(
+            Key.UP to Command.VOL_UP,
+            Key.DOWN to Command.VOL_DOWN,
+            Key.LEFT to Command.BRIGHTNESS_DOWN,
+            Key.RIGHT to Command.BRIGHTNESS_UP
+        )),
+
+        onRepeat = HashMap(mapOf(
+            Key.UP to Command.VOL_UP,
+            Key.DOWN to Command.VOL_DOWN,
+            Key.LEFT to Command.BRIGHTNESS_DOWN,
+            Key.RIGHT to Command.BRIGHTNESS_UP
+        ))
+    )
 
     override val mode: String = "fn"
 
@@ -17,23 +37,62 @@ class FNInputMode: InputMode {
     }
 
     override fun onKeyDown(key: Key, composing: Boolean): KeyEventResult {
-        return KeyEventResult()
+        return when(keyCommandResolver.getCommand(key)) {
+            Command.VOL_UP -> volumeUp()
+            Command.VOL_DOWN -> volumeDown()
+            Command.BRIGHTNESS_DOWN -> brightnessDown()
+            Command.BRIGHTNESS_UP -> brightnessUp()
+            else -> KeyEventResult(false)
+        }
     }
 
     override fun onKeyLongDown(key: Key, composing: Boolean): KeyEventResult {
-        return KeyEventResult()
+        return KeyEventResult(false)
     }
 
     override fun onKeyDownRepeatedly(key: Key, repeat: Int, composing: Boolean): KeyEventResult {
-        return KeyEventResult()
+        return when(keyCommandResolver.getCommand(key, repeat =  repeat)) {
+            Command.VOL_UP -> volumeUp()
+            Command.VOL_DOWN -> volumeDown()
+            Command.BRIGHTNESS_DOWN -> brightnessDown()
+            Command.BRIGHTNESS_UP -> brightnessUp()
+            else -> KeyEventResult(false)
+        }
     }
 
     override fun afterKeyDown(key: Key, composing: Boolean): KeyEventResult {
-        return KeyEventResult()
+        return KeyEventResult(false)
     }
 
     override fun afterKeyLongDown(key: Key, keyDownMS: Long, composing: Boolean): KeyEventResult {
-        return KeyEventResult()
+        return KeyEventResult(false)
     }
 
+    private fun brightnessDown(): KeyEventResult {
+        return KeyEventResult(
+            consumed = true,
+            decreaseBrightness = true
+        )
+    }
+
+    private fun brightnessUp(): KeyEventResult {
+        return KeyEventResult(
+            consumed = true,
+            increaseBrightness = true
+        )
+    }
+
+    private fun volumeUp(): KeyEventResult {
+        return KeyEventResult(
+            consumed = true,
+            increaseVolume = true
+        )
+    }
+
+    private fun volumeDown(): KeyEventResult {
+        return KeyEventResult(
+            consumed = true,
+            decreaseVolume = true
+        )
+    }
 }
\ No newline at end of file
diff --git a/app/src/main/java/net/mezimmah/wkt9/keypad/Command.kt b/app/src/main/java/net/mezimmah/wkt9/keypad/Command.kt
index ca4b4aa..935eb65 100644
--- a/app/src/main/java/net/mezimmah/wkt9/keypad/Command.kt
+++ b/app/src/main/java/net/mezimmah/wkt9/keypad/Command.kt
@@ -12,6 +12,10 @@ enum class Command {
     NAVIGATE,
     RIGHT,
     LEFT,
+    VOL_UP,
+    VOL_DOWN,
+    BRIGHTNESS_DOWN,
+    BRIGHTNESS_UP,
     RECORD,
     TRANSCRIBE,
     BACK,
diff --git a/app/src/main/java/net/mezimmah/wkt9/keypad/KeyEventResult.kt b/app/src/main/java/net/mezimmah/wkt9/keypad/KeyEventResult.kt
index bd325e8..e188ca4 100644
--- a/app/src/main/java/net/mezimmah/wkt9/keypad/KeyEventResult.kt
+++ b/app/src/main/java/net/mezimmah/wkt9/keypad/KeyEventResult.kt
@@ -23,5 +23,9 @@ data class KeyEventResult(
     val updateWordStatus: Boolean = false,
     val focus: Boolean = false,
     val switchInputMode: WKT9InputMode? = null,
-    val functionMode: Boolean = false
+    val functionMode: Boolean = false,
+    val increaseVolume: Boolean = false,
+    val decreaseVolume: Boolean = false,
+    val increaseBrightness: Boolean = false,
+    val decreaseBrightness: Boolean = false
 )