Real-Time AudioSuite (RTAS) is an

audio plug-in An audio plug-in, in computer software, is a Plug-in (computing), plug-in that can add or enhance audio-related functions in a computer program, typically a digital audio workstation. Such functions may include digital signal processing or soun ...

format developed by

Digidesign Avid Audio (formerly Digidesign) is an American digital audio technology company. It was founded in 1984 by Peter Gotcher and Evan Brooks. The company began as a project to raise money for the founders' band, selling EPROM chips for drum machin ...

, currently

Avid Technology Avid Technology, Inc. is a global technology company headquartered in Burlington, Massachusetts, and was founded in August 1987 by Bill Warner. It develops software, SaaS, and hardware products used in media and entertainment. History Avid wa ...

, for their Pro Tools LE and Pro Tools M-Powered systems, although they can be run on Pro Tools HD and Pro Tools TDM systems. RTAS plug-ins use the processing power of the host computer rather than DSP cards used in the Pro Tools HD systems. As the name suggests, the plug-in architecture is designed to be run in

real-time Real-time, realtime, or real time may refer to: Computing * Real-time computing, hardware and software systems subject to a specified time constraint * Real-time clock, a computer clock that keeps track of the current time * Real-time Control Syst ...

, mimicking hardware inserts on traditional

mixing console A mixing console or mixing desk is an electronic device for Audio mixing (recorded music), mixing audio signals, used in sound recording and reproduction and sound reinforcement systems. Inputs to the console include microphones, signals fro ...

. This is in contrast to rendering files out of time with effects applied directly to the audio, which in Pro Tools is facilitated by AudioSuite Plug-ins. Avid's AAX format, which runs on both native CPU and Pro Tools HDX DSP, is the replacement for RTAS.

Obsolescence

On April 7, 2013, Avid announced

Pro Tools Pro Tools is a digital audio workstation (DAW) developed and released by Avid Technology (formerly Digidesign) for Microsoft Windows and macOS. It is used for music creation and production, sound for picture (sound design, audio post-productio ...

11. From this version forward, Avid has made the AAX plug-in the only format supported by Pro Tools. At launch, many third-party plug-in developers have yet to port their software to the new AAX format, so Avid will sell Pro Tools 11 with both an 11 and 10 license, allowing users to run Pro Tools 10.3.8, which is the last version that will support RTAS.

Licensing

Most plug-ins employ some form of

copy protection Copy protection, also known as content protection, copy prevention and copy restriction, is any measure to enforce copyright by preventing the reproduction of software, films, music, and other media. Copy protection is most commonly found on vid ...

, notably the PACE

iLok Ilok () is the easternmost town in Croatia forming a geographic salient surrounded by Vojvodina. Located in the Syrmia region, it lies on the Fruška Gora hill overlooking the Danube river, which forms the border with the Bačka region of Serbi ...

dongle A dongle is a small piece of computer hardware that connects to a port on another device to provide it with additional functionality, or enable a pass-through to such a device that adds functionality. In computing, the term was initially synony ...

. Though there are some plug-ins available

free of charge The adjective ''free'' in English is commonly used in one of two meanings: "at no monetary cost" (''gratis'') or "with little or no restriction" (''libre''). This ambiguity can cause issues where the distinction is important, as it often is in ...

, there is no accompanying

source code In computing, source code, or simply code or source, is a plain text computer program written in a programming language. A programmer writes the human readable source code to control the behavior of a computer. Since a computer, at base, only ...

or programming documentation available to the general public. Developers must contact Avid for the SDK. There are terms of disclosure on releasing information about Avid's development materials, making official RTAS development incompatible with

open-source software Open-source software (OSS) is Software, computer software that is released under a Open-source license, license in which the copyright holder grants users the rights to use, study, change, and Software distribution, distribute the software an ...

Virtual Studio Technology Rewrapping

FXpansion Audio produces a VST to RTAS converter which allows the use of plug-ins developed under

Steinberg Steinberg Media Technologies GmbH (trading as Steinberg; ) is a German musical software and hardware company based in Hamburg. It develops software for writing, recording, arranging and editing music, most notably Cubase, Nuendo, and Dorico. It ...

's development environment inside of Pro Tools, expanding the DAW's processing capabilities. FXpansion has stated that an RTAS to VST converter can not happen "for both technical and legal reasons."VST–RTAS Adapter FAQ
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Competing technologies

Apple Inc. Apple Inc. is an American multinational corporation and technology company headquartered in Cupertino, California, in Silicon Valley. It is best known for its consumer electronics, software, and services. Founded in 1976 as Apple Comput ...

Audio Units Audio Units (AU) are a system-level Plug-in (computing), plug-in architecture provided by Core Audio in Apple Inc., Apple's macOS and iOS operating systems. Audio Units are a set of application programming interface (API) services provided by t ...

LADSPA The Linux Audio Developer's Simple Plugin API (LADSPA) is an application programming interface (API) standard for handling audio filters and audio signal processing effects, licensed under LGPL-2.1-or-later. Originally designed through consensus ...

, DSSI and LV2 for

Linux Linux ( ) is a family of open source Unix-like operating systems based on the Linux kernel, an kernel (operating system), operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically package manager, pac ...

Microsoft Microsoft Corporation is an American multinational corporation and technology company, technology conglomerate headquartered in Redmond, Washington. Founded in 1975, the company became influential in the History of personal computers#The ear ...

DirectX Microsoft DirectX is a collection of application programming interfaces (APIs) for handling tasks related to multimedia, especially game programming and video, on Microsoft platforms. Originally, the names of these APIs all began with "Direct" ...

* Steinberg's

Virtual Studio Technology Virtual Studio Technology (VST) is an audio plug-in software interface that integrates software synthesizers and effects units into digital audio workstations. VST and similar technologies use digital signal processing to simulate traditional rec ...

References

{{DEFAULTSORT:Real Time Audiosuite Music software plugin architectures MacOS APIs Digital audio workstation software