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MidiFire
(From the App Store description) MidiFire is a free-form, modular CoreMIDI router, processor, monitor and clock source.
App type: App
App store link: 
Developer: Audeonic Apps
Developer AB Forum Handle: @Audeonic
Additional Info
MidiFire is primarily GUI based, but also includes the scripting language found in the Streambyter AU Midi plugin.
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