Hi

I’m experiencing a bug with my AUv3 when hosted within Logic Pro (both Mac and 
iPadOS). When a project containing my plugin is re-opened, the plugin’s own 
virtual keyboard does not trigger the synth’s audio engine. It appears silent 
or suspended. When the Logic transport is started, or MIDI is sent from an 
external instrument, or MIDI is sent from Logic’s own virtual keyboard, my 
plugin “wakes up” and the audio engine is behaving as expected. During the 
suspended phase, the plugin’s UI behaves as expected.
I’ve managed to get the Xcode debugger connected to my AUv3 and observed that 
the render callback is not called until the transport starts or MIDI received.

This is the last major bug, so any help will be appreciated in understand what 
the fix is.

Thanks
peter
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