Have a look at Ardour Win/Lin/Mac https://community.ardour.org/download
Harrison MixBus uses the Ardour source http://www.harrisonconsoles.com/site/mixbus.html
What would be easier modifying Ardour source to work with Win bbw2.exe and a Mac bbw2.app as Realband does or reprogram RealBand to Win Mac 32/64 or leave it as it is or ReWire (in progress) and/or a VST that uses Win bbw2.exe and a Mac bbw2.app ???


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