@d-healey Yeah I think this has been around for a while. MIDI FX only works as AU. For VST3, you have to compile VST3i .

It's been a few months since I last tested MIDI FX. I think I have a bug report on github about the differences between HISE and compiled version MIDI output as well.

@christoph-hart I'm trying to use the MusicBox demo to check out the VU meter example code. Latest version of HISE (4/24/18) crashes on File -> Load new project.