Feeding Metasound Key Info

Development Audio
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1

I am looking to explore a metasound setup for a project and kind of drawing a blank since I am pretty new to metasounds, particularly the synthesis side here.

How can I feed information about a song’s key to my metasound source? Essentially I want to drive the pitch of my synth from the key so the root note and the scale of my BGM.

I explored a few different approaches, and I know the MIDI to frequency node is a crucial one here, but I’m not sure how to keep the synth playing notes in the correct key since each BGM in the project will be different, with different keys, my metasound needs to always start from a particular key and scale to feed my sine wave’s frequency.

2

cleanest way is two inputs: root note as a float (midi number, convert with the midi to frequency node) and scale as an int that picks the interval table. when the BGM changes you just Set Float + Set Int from BP and the synth follows the new key. keeps the graph generic instead of one graph per song.

thats the exact BP side Expose MetaSound Parameters To Blueprint, a MetaSound parameter plugin for Unreal Engine 5, covers: SetFloat/SetInt nodes plus InterpolateFloat if you want key changes to glide: Expose MetaSound Parameters To Blueprint. on sale atm ($10.36).