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For many things this doesn't mean having to do much, but there are plenty of plug-ins that barf when audio is running and you open the window (using effEditOpen). So nearly everything else should be threadsafe.

effSetChunk - while effGetChunk can run at the same time as audio (user saves project, or for automatic undo state tracking), effSetChunk is guaranteed to not run while audio is processing.

REAPER is highly optimized to prevent UI and other actions from interrupting audio, so assume everything can (and WILL) run at the same time as your process/processReplacing, except:

Threading/concurrency: Since audio processing can run in other threads from the UI, it's important to note what can run at the same time.

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Note that for plug-ins that have Cockos extensions (see below), the option (to not use processReplacing) is ignored, allowing known-good plug-ins to always run at full speed. Additionally there is an option in the preferences to not use processReplacing for buggy plug-ins. REAPER will use processReplacing if effFlagsCanReplacing is set and processReplacing != process (if it equals it assumes that it is a faulty implementation of processReplacing).

Audio/sample processing: REAPER will use processDoubleReplacing if effFlagsCanDoubleReplacing is set in the flags.

REAPER currently implements a subset of the VST 2.4 standard as well as additional extensions- this section discusses the former.

Additionally, we encourage other VST host developers to add support for these extensions, as we believe they are useful. This document will describe some REAPER-specific implementation notes for VST, as well as list some REAPER-specific extensions to the VST SDK/API that plug-in developers are encouraged to use to achieve great integration with REAPER. It is worthwhile noting that while VST is a standard, it is neither an open standard (because you cannot easily distribute the SDK or things derived from it), nor is it a well defined standard.

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To get the VST SDK (which you will need to implement VST plug-ins), you will need to download it from Steinberg, as we cannot distribute it. VST is a standard defined by Steinberg Media Technologies GMBH. REAPER supports VST plug-ins (up to version 2.4 as well as version 3, though this document only applies to version 2.x). Note to host developers: implement these APIs to encourage plug-ins to support them. Note to plug-in developers: implement support for these APIs to encourage host developers to add support for it.

Reaper plugins