Question about local parameters and command instruments

[Jan]

This is a separate issue that I’ve run into while trying to achieve this:

Returned global parameter value not what it should be

I’ve added a global parameter “TrackNumber”. In an event I have all my music tracks one after another and use this parameter to select the active one: [grafik] Each track is a nested event. When it’s finished, a command instrument increases the TrackNumber value by one: [grafik] This way I’m getting a nicely playing track playlist, but I’m also able to select the active track from code by just setting the TrackNumber parameter directly. However, since the tracks increase the global parame…

When I use a command instrument to modify a LOCAL parameter, this has no effect. It only works for global parameters.

I’ve set this flag:

Which sounds like it should make this work? Or am I missing something?

If this is not supported, then it would be good if the UI wouldn’t let me choose a local parameter to modify in the first place.

Edit: The command instrument is inside a nested event, so it should modify the parameter value of the surrounding event.

This is with FMOD version 2.02.20.

[Leah_FMOD]

What you’re observing is expected behavior. While local parameters in referenced events can be exposed recursively, parameter value changes only take effect moving down the referencing hierarchy - parameter value changes originating from the referenced event don’t affect the exposed parameter value in the referencing event.

For a situation like this, I would recommend using a global parameter instead of a local parameter. If a global parameter isn’t suitable for the event behavior you’re trying to set up, can I get you to elaborate on what exactly you’re trying to do so that I can understand the situation a bit better, and hopefully suggest a workaround?

[Jan]

Sorry, didn’t see your response until now. I would expect to get e-mails for answers, but apparently I don’t.

Anyway, I did solve it using a global parameter instead, but I still wanted to understand this.

I was trying to do the same thing as here:

Returned global parameter value not what it should be

I’ve added a global parameter “TrackNumber”. In an event I have all my music tracks one after another and use this parameter to select the active one: [grafik] Each track is a nested event. When it’s finished, a command instrument increases the TrackNumber value by one: [grafik] This way I’m getting a nicely playing track playlist, but I’m also able to select the active track from code by just setting the TrackNumber parameter directly. However, since the tracks increase the global parame…

Just with a local value instead. Ie an event that represents my music playlist and automatically moves forward when one track ends.

There are probably many ways that this could be done, I’m still a beginner when it comes to using FMOD.

[li_fmod]

Hi,

Thank you for all the information.

For using local parameters(FMOD Studio | 27. Glossary | 27.72 Local Parameter), while the local parameter in the main event can affect the nested events, the reverse is not true. Any changes or commands issued from within the nested events do not have the capability to alter the parameter values set in the main event.

I can’t really provide a good answer in that case, as your way of approaching this specific event behavior is what we’d recommend.