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:layout_marginStart="12dp"
        android:layout_marginEnd="12dp">

        <RelativeLayout
            android:id="@+id/aEffectsPanel"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="12dp"
            android:layout_marginBottom="10dp"
            android:gravity="center_vertical">

            <RelativeLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1">
                <com.android.gallery3d.ui.Knob
                    android:id="@+id/bBStrengthKnob"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_centerHorizontal="true"
                    custom:foreground="@drawable/knob"/>
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_centerHorizontal="true"
                    android:layout_below="@id/bBStrengthKnob"
                    android:layout_marginTop="12dp"
                    android:textColor="@android:color/black"
                    android:text="@string/bass_boost_strength"/>
            </RelativeLayout>

            <RelativeLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginEnd="24dp"
                android:layout_alignParentRight="true"
                android:layout_weight="1">
                <com.android.gallery3d.ui.Knob
                    android:id="@+id/vIStrengthKnob"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_centerHorizontal="true"
                    custom:foreground="@drawable/knob"/>
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_below="@id/vIStrengthKnob"
                    android:layout_marginTop="12dp"
                    android:layout_centerHorizontal="true"
                    android:textColor="@android:color/black"
                    android:text="@string/virtualizer_strength"/>
            </RelativeLayout>
        </RelativeLayout>
    </LinearLayout>
</LinearLayout>