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Hi.I thought you might want to check out MIDIEditor -https://www.midieditor.org/Which is a free MIDI editor where you can create and modify MIDI messages,save them,and have them reflected in the Wwise authoring tool.Also OpenMusic is a great tool for batch MIDI message generation(you can certainly learn more about Python!)Here's a live streaming we did recently.https://youtu.be/F06FphCm6IsSome of these MIDI usages may be of interest to you.
Further more,
I'm writing a blog abou how to build a step sequencer by using Wwise Authoring,
So stay tune!