Audio Modulation and MetaSounds within MetaSounds?

Development Audio
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Having an issue where it seems like Control Busses (via Parameter Patch) are not affecting a MetaSound when the graph is added to another MetaSound. Is this by design or should I still be able to affect the volume, in this case, of all MetaSounds that have the Control Bus/Parameter Patch assigned?

Things I have done:

  • Control Busses are added to a Control Bus Mix.
  • Control Bus Mix is activated.
  • Parameter Patch A has Control Bus A and is assigned to MetaSound A.
  • Parameter Patch B has Control Bus A & B and is assigned to MetaSound B.
  • Parameter Patch C has Control Bus A & C and is assigned to MetaSound C.
  • MetaSound B & C graphs are added to MetaSound A.
  • Control Busses do affect MetaSound A, but not MetaSound B or C.
  • Volume Routing is set to Union, Modulate is true, and Parameter Patch is assigned in the Modulation tab in the Details Panel for all applicable MetaSounds.
2

Per the Unreal Source Discord server:

Only the outermost MetaSound is the Source. Any sub graph is just a sub graph.
It’s just a way to reuse and organize graphs.

In other words, it’s by design and I misunderstood it from the beginning :sweat_smile:
Only the outermost MetaSound is going to be affected by the Parameter Patch.

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