Well this is weird. The conditions that seem to cause it are a midi track with a juce plugin needs to selected (it doesn’t matter if the gui is open) and the musical typing /keyboard window is open for the first time since logic launched. Launching the musical typing window seems to reset logics copy of the parameter internally and then uses the SetParameter method in juce_AU_Wrapper.mm to tell juce to the parameter should be updated. Any one every come across this? Also I check and real midi signals or plugging in actual midi equipment doesn’t have the same effect. I just have no idea why logic is sending any kinda signal when this window opens that affects the parameters of the currently armed synth plugin.