res/layout/audio_effects_dialog.xml

<?xml version="1.0" encoding="utf-8"?>
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:custom="http://schemas.android.com/apk/res/com.android.gallery3d"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:gravity="center">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:gravity="center_horizontal"
        android:paddingBottom="10dp">

        <Switch
            android:id="@+id/audio_effects_switch"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/audio_effects"
            android:textAppearance="?android:attr/textAppearanceSmall"
            android:layout_marginTop="10dp"
            android:layout_marginLeft="25dp"
            android:layout_marginRight="30dp" />

        <LinearLayout
            android:id="@+id/aEffectsPanel"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="10dp"
            android:gravity="center_vertical">

            <com.android.gallery3d.ui.Knob
                android:id="@+id/bBStrengthKnob"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                custom:label="@string/bass_boost_strength"
                custom:background="@drawable/knob_bg"
                custom:foreground="@drawable/knob" />

            <com.android.gallery3d.ui.Knob
                android:id="@+id/vIStrengthKnob"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                custom:label="@string/virtualizer_strength"
                custom:background="@drawable/knob_bg"
                custom:foreground="@drawable/knob" />

        </LinearLayout>
    </LinearLayout>
</LinearLayout>