Overriding event trigger in 'derived style'

See more:

XAML

WPF

Hi
I have I short question regarding wpf styles and triggers. Let's say I have the following style.

<Style x:Key="ButtonStyleBase" TargetType="{x:Type Button}">
        <Style.Triggers>
            <EventTrigger RoutedEvent="PreviewMouseDown">
                <SoundPlayerAction Source="ButtonSound.wav" />
            </EventTrigger>
        </Style.Triggers>
    </Style>

Another style is based on the previous one like:

<Style x:Key="SilentButtonStyle" TargetType="{x:Type Button} BasedOn="{StaticResource ButtonStyleBase}">
  
</Style>

How can I disable the event trigger in the SilentButton stlye? Is there any way of doing that - beside the obvious one - using another style as a base style or without using the base style at all.