One small tweak to improve the new Edit Instrument Mixer buttons

Love that Instrument Tracks now have their own button in the MixConsole instead of sharing the “e” button. One small change that would really improve it - make it so clicking on the Instrument button when the VSTi GUI is open would close it.

Often I only want to open a VSTi to look at something, not to adjust anything. Being able to use just the Instrument button for Open-Look-Close without moving the mouse would be great.