ABStemPlayer/ABStemPlayer/Views/MixerControl.axaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:vm="using:ABStemPlayer.ViewModels"
             x:DataType="vm:MixerViewModel"
             xmlns:conv="using:ABStemPlayer.Converters"
             x:Class="ABStemPlayer.Views.MixerControl">

    <UserControl.Resources>
        <conv:StemTypeToNameConverter x:Key="StemTypeToNameConverter"/>
    </UserControl.Resources>

    <Border Padding="8"
            Background="#202020"
            CornerRadius="4">

        <!-- Dynamic stems -->
        <ItemsControl ItemsSource="{Binding Stems}">
            <ItemsControl.ItemsPanel>
                <ItemsPanelTemplate>
                    <StackPanel Orientation="Horizontal"
                                Spacing="16"/>
                </ItemsPanelTemplate>
            </ItemsControl.ItemsPanel>

            <ItemsControl.ItemTemplate>
                <DataTemplate x:DataType="vm:StemChannelViewModel">

                    <!-- One mixer column -->
                    <Grid Width="80"
                          RowDefinitions="Auto,*,Auto,Auto,Auto">

                        <!-- Stem name -->
                        <TextBlock Grid.Row="0"
                                   Text="{Binding Type, Converter={StaticResource StemTypeToNameConverter}}"
                                   HorizontalAlignment="Center"
                                   Margin="0,0,0,4"
                                   Foreground="#f0f0f0"/>

                        <!-- Gain slider -->
                        <Slider Grid.Row="1"
                                Orientation="Vertical"
                                Minimum="-24"
                                Maximum="12"
                                Value="{Binding GainDb}"
                                VerticalAlignment="Stretch"
                                MinHeight="100"/>

                        <!-- Gain readout -->
                        <TextBlock Grid.Row="2"
                                   Text="{Binding GainDb, StringFormat='{}{0:F1} dB'}"
                                   HorizontalAlignment="Center"
                                   Margin="0,4,0,4"
                                   Foreground="#c0c0c0"/>

                        <!-- Pan slider -->
                        <Slider Grid.Row="3"
                                Orientation="Horizontal"
                                Minimum="-1"
                                Maximum="1"
                                Value="{Binding Pan}"
                                Margin="0,4,0,0"/>

                        <!-- Pan + enabled -->
                        <StackPanel Grid.Row="4"
                                    Orientation="Vertical"
                                    HorizontalAlignment="Center">
                            <TextBlock Text="Pan"
                                       HorizontalAlignment="Center"
                                       Foreground="#c0c0c0"
                                       Margin="0,2,0,2"/>
                            <ToggleSwitch IsChecked="{Binding Enabled}"
                                          Content="On"
                                          HorizontalAlignment="Center"
                                          Margin="0,4,0,0"/>
                        </StackPanel>

                    </Grid>
                </DataTemplate>
            </ItemsControl.ItemTemplate>
        </ItemsControl>

    </Border>
</UserControl>