Acoustica Mixcraft 7 - Manual (Page 228)

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Master FX can also be edited by clicking the Main Mix FX button in the Mixer tab:
... or by clicking the FX button in the Master Track in the track list (if currently
displayed):
ADDING THIRD-PARTY VST EFFECTS
If you’ve installed a third-party VST effect and you’re not seeing it Mixcraft’s effects
menu, you'll need to add the VST effect folder.
Select Preferences>Plug-Ins and click the Edit VST/VSTi Folders button.