Gadgetbridge/app/src/main/res/xml/devicesettings_sony_headphones_equalizer.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.preference.PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
    <PreferenceCategory
        android:key="pref_key_equalizer"
        android:title="@string/pref_header_equalizer">

        <ListPreference
            android:defaultValue="off"
            android:entries="@array/sony_equalizer_mode_names"
            android:entryValues="@array/sony_equalizer_mode_values"
            android:icon="@drawable/ic_graphic_eq"
            android:key="pref_sony_equalizer_mode"
            android:summary="%s"
            android:title="@string/sony_equalizer" />

        <PreferenceScreen
            android:icon="@drawable/ic_extension"
            android:key="pref_sony_equalizer_preset_manual"
            android:persistent="false"
            android:title="@string/pref_header_sony_equalizer_preset_manual">

            <PreferenceCategory
                android:key="pref_key_equalizer"
                android:title="@string/pref_header_sony_equalizer_preset_manual">

                <SeekBarPreference
                    android:defaultValue="10"
                    android:icon="@drawable/ic_graphic_eq"
                    android:key="pref_sony_equalizer_manual_band_400"
                    android:max="20"
                    android:title="@string/sony_equalizer_band_400" />
                <SeekBarPreference
                    android:defaultValue="10"
                    android:icon="@drawable/ic_graphic_eq"
                    android:key="pref_sony_equalizer_manual_band_1000"
                    android:max="20"
                    android:title="@string/sony_equalizer_band_1000" />
                <SeekBarPreference
                    android:defaultValue="10"
                    android:icon="@drawable/ic_graphic_eq"
                    android:key="pref_sony_equalizer_manual_band_2500"
                    android:max="20"
                    android:title="@string/sony_equalizer_band_2500" />
                <SeekBarPreference
                    android:defaultValue="10"
                    android:icon="@drawable/ic_graphic_eq"
                    android:key="pref_sony_equalizer_manual_band_6300"
                    android:max="20"
                    android:title="@string/sony_equalizer_band_6300" />
                <SeekBarPreference
                    android:defaultValue="10"
                    android:icon="@drawable/ic_graphic_eq"
                    android:key="pref_sony_equalizer_manual_band_16000"
                    android:max="20"
                    android:title="@string/sony_equalizer_band_16000" />
                <SeekBarPreference
                    android:defaultValue="10"
                    android:icon="@drawable/ic_speaker"
                    android:key="pref_sony_equalizer_manual_clear_bass"
                    android:max="20"
                    android:title="@string/sony_equalizer_clear_bass" />
            </PreferenceCategory>
        </PreferenceScreen>

        <PreferenceScreen
            android:icon="@drawable/ic_extension"
            android:key="pref_sony_equalizer_preset_custom_1"
            android:persistent="false"
            android:title="@string/pref_header_sony_equalizer_preset_custom_1">

            <PreferenceCategory
                android:key="pref_key_equalizer"
                android:title="@string/pref_header_sony_equalizer_preset_custom_1">

                <SeekBarPreference
                    android:defaultValue="10"
                    android:icon="@drawable/ic_graphic_eq"
                    android:key="pref_sony_equalizer_custom_1_band_400"
                    android:max="20"
                    android:title="@string/sony_equalizer_band_400" />
                <SeekBarPreference
                    android:defaultValue="10"
                    android:icon="@drawable/ic_graphic_eq"
                    android:key="pref_sony_equalizer_custom_1_band_1000"
                    android:max="20"
                    android:title="@string/sony_equalizer_band_1000" />
                <SeekBarPreference
                    android:defaultValue="10"
                    android:icon="@drawable/ic_graphic_eq"
                    android:key="pref_sony_equalizer_custom_1_band_2500"
                    android:max="20"
                    android:title="@string/sony_equalizer_band_2500" />
                <SeekBarPreference
                    android:defaultValue="10"
                    android:icon="@drawable/ic_graphic_eq"
                    android:key="pref_sony_equalizer_custom_1_band_6300"
                    android:max="20"
                    android:title="@string/sony_equalizer_band_6300" />
                <SeekBarPreference
                    android:defaultValue="10"
                    android:icon="@drawable/ic_graphic_eq"
                    android:key="pref_sony_equalizer_custom_1_band_16000"
                    android:max="20"
                    android:title="@string/sony_equalizer_band_16000" />
                <SeekBarPreference
                    android:defaultValue="10"
                    android:icon="@drawable/ic_speaker"
                    android:key="pref_sony_equalizer_custom_1_clear_bass"
                    android:max="20"
                    android:title="@string/sony_equalizer_clear_bass" />
            </PreferenceCategory>
        </PreferenceScreen>

        <PreferenceScreen
            android:icon="@drawable/ic_extension"
            android:key="pref_sony_equalizer_preset_custom_2"
            android:persistent="false"
            android:title="@string/pref_header_sony_equalizer_preset_custom_2">

            <PreferenceCategory
                android:key="pref_key_equalizer"
                android:title="@string/pref_header_sony_equalizer_preset_custom_2">

                <SeekBarPreference
                    android:defaultValue="10"
                    android:icon="@drawable/ic_graphic_eq"
                    android:key="pref_sony_equalizer_custom_2_band_400"
                    android:max="20"
                    android:title="@string/sony_equalizer_band_400" />
                <SeekBarPreference
                    android:defaultValue="10"
                    android:icon="@drawable/ic_graphic_eq"
                    android:key="pref_sony_equalizer_custom_2_band_1000"
                    android:max="20"
                    android:title="@string/sony_equalizer_band_1000" />
                <SeekBarPreference
                    android:defaultValue="10"
                    android:icon="@drawable/ic_graphic_eq"
                    android:key="pref_sony_equalizer_custom_2_band_2500"
                    android:max="20"
                    android:title="@string/sony_equalizer_band_2500" />
                <SeekBarPreference
                    android:defaultValue="10"
                    android:icon="@drawable/ic_graphic_eq"
                    android:key="pref_sony_equalizer_custom_2_band_6300"
                    android:max="20"
                    android:title="@string/sony_equalizer_band_6300" />
                <SeekBarPreference
                    android:defaultValue="10"
                    android:icon="@drawable/ic_graphic_eq"
                    android:key="pref_sony_equalizer_custom_2_band_16000"
                    android:max="20"
                    android:title="@string/sony_equalizer_band_16000" />
                <SeekBarPreference
                    android:defaultValue="10"
                    android:icon="@drawable/ic_speaker"
                    android:key="pref_sony_equalizer_custom_2_clear_bass"
                    android:max="20"
                    android:title="@string/sony_equalizer_clear_bass" />
            </PreferenceCategory>
        </PreferenceScreen>
    </PreferenceCategory>
</androidx.preference.PreferenceScreen>