This is REAPER.
REAPER is a complete digital audio production application for computers, offering a full multitrack audio and MIDI recording, editing, processing, mixing and mastering toolset.
REAPER supports a vast range of hardware, digital formats and plugins, and can be comprehensively extended, scripted and modified.
Do Anything

REAPER's full, flexible feature set and renowned stability have found a home wherever digital audio is used: commercial and home studios, broadcast, location recording, education, science and research, sound design, game development, and more.

From mission-critical professional environments to students' laptops, there is a single version of REAPER, fully featured with no artificial limitations. You can evaluate REAPER in full for 60 days. A REAPER license is affordably priced and DRM-free.

Constant Evolution

A new REAPER 6 license includes unlimited free updates through REAPER version 7.99. Frequency varies, but updates are typically released every few weeks.

These updates include bug fixes, feature improvements, and significant new features, all of which are free. Updates only take a minute or so. All preferences and configurations are preserved, and forward and backward compatibility are maintained.

Feature Highlights

  • Efficient, fast to load, and tightly coded. Can be installed and run from a portable or network drive.
  • Powerful audio and MIDI routing with multichannel support throughout.
  • 64-bit internal audio processing. Import, record to, and render to many media formats, at almost any bit depth and sample rate.
  • Thorough MIDI hardware and software support.
  • Support for thousands of third-party plug-in effects and virtual instruments, including VST, VST3, LV2, AU, DX, and JS.
  • Hundreds of studio-quality effects for processing audio and MIDI, and built-in tools for creating new effects.
  • Automation, modulation, grouping, VCA, surround, macros, OSC, scripting, control surfaces, custom skins and layouts.
  • A whole lot more.

CLAP
do not apply plugin PDC/latency to MIDI events if the plugin produces MIDI output
fix interpolating parameter values in first buffer block after playback start
prevent adding duplicate parameter change events to event queue ...
Command line
support passing reascript on command line, for example: 'reaper.exe projectfile.rpp scriptfile.lua'
support inserting media or running reascripts in already-running REAPER instance, for example: 'reaper.exe -nonewinst media.wav scriptfile.lua'
FX
improve anticipative FX scheduling to improve performance with slow media disks
improve performance of anticipative FX multiprocessing on folder tracks that use PDC
improve performance of anticipative FX multiprocessing in various other routing contexts
macOS
add option in prefs/buffering/advanced to view or change open-file limit
support controlling existing instance of REAPER via command line (parity with other OSes)
more...
New in Version 6
FX Plug-in Embedding:Embed small versions of some plug-ins into your tracks control and mixer panels, including ReaEQ, ReaFIR, ReaXcomp, graphical JSFX plug-ins, and more
MIDI CC Envelopes:Handle MIDI CC data as continuous data envelopes, rather than discrete events; create smooth, musical articulations and effects
Auto-stretch Timebase:Automatically stretch and reconform audio around complex tempo changes; easily work with tempo-mapped and live-played recordings together
Routing Diagram:View and edit project routing using a high-level graphical patchbay emulation
Retina/HiDPI:Automatic rendering to HiDPI and Retina displays; new Default 6 theme supports 100%, 150% and 200% natively
Big Project Improvements:Vastly optimized behavior for projects with high (200+) track counts; Metal display support for massively faster screen drawing on newer macOS displays
..and More:New theme with extensive customizability via Tweaker script; Dynamic Split improvements; import and render media with embedded transient information; per-track positive or negative playback offset; faster and higher quality samplerate conversion; and many other fixes and improvements


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