Pro Tools uses a proprietary plug-in format called RTAS (Real Time AudioSuite) which is equivalent to the open source VST plugin format used in other sequencers such as Logic and Cubase. As anyone can create their own VSTs and release them to the public, there are literally thousands of VST plugins out there, ranging in price from free to remarkably expensive. As there is no quality control system on these plugins, their usefulness also varies a lot – but at least for the free plugins, you don’t have much to lose by giving them a go. For Pro Tools users, however, there are still a few ways to expand your RTAS plugin arsenal on the cheap…
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