Later versions use the Avid Audio Extension format of plug-ins Time Division Multiplexing (TDM) Pro Tools 10 was the last version to support the Real Time Audio Suite format. There existed in the past, a VST to RTAs converter made by the FXpansion Audio company but due to legal roadblocks (RTAS being a proprietary software format) the development of a RTAs to VST converter has been rendered impossible. This made the processing of audio much smoother. This format was designed to use the processing power from the CPU of the computer that they are installed on as opposed to Digital Signal Processor chips. Real Time Audio Suite ( RTAs pronounced are-tazz) is a plug-in format developed by Digidesign for the Pro Tools LE, Pro Tools HD and Pro Tools TDM. Audio Unit plug-ins can be used to perform sample rate conversion and time stretching in addition to doing everything else that VST plug-ins can. Audio Unit plug-ins are Apple’s answer to VSTs. This allows them to generate and/or process sound and audio with minimal delay. The main difference between Audio Units and other plug-in formats is that whereas plug-ins of other formats are installed to specified locations on the computer hard drive, Audio Unit plug-ins practically become part of the computers operating system. The Audio Unit plug-in format, commonly shortened to AU is a plug-in format designed to work on Mac OS as part of the Core Audio API system. The same applies to surround channels for surround mixing (5.1, 7.1 etc) Audio Units (AU) This means that if a VST 3 plug-in is applied to a stereo channel, the plug-in will adapt itself for stereo input and output. Inputs and Output Routing-VST 3 plug-ins can also have multiple inputs and outputs unlike VST and VST 2 which could only be routed to a single MIDI input/output.ĭynamic Input and Output- VST 3 plug-ins also adapt to the configuration of the channel that it is applied to. This leads to waste of CPU resources when using VST 2. VST 2 plug-ins on the other hand are always working. Resource management-Unlike VST 2, VST 3 plug-ins only work when they detect an audio signal coming through their inputs. Recommended Reads: How to Rescan Plugins in Pro Tools VST2 vs VST3
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