This is REAPER.
REAPER is a complete digital audio production application for Windows and OS X, 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 5 license includes unlimited free updates through REAPER version 6.99. 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, 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.

REAPER 5.27:
support PDF export
add various minor improvements in appearance
clear all comp/group names when creating new project .
improve handling of comp names with undo and cut/paste .
respect grouping when loading comp or moving active comp to top lane . ...
add menu item to copy FX with automation, bound to ctrl+alt+C
support drag and drop copy with automation via shift+ctrl+drag FX
add Copy/Paste to mixer FX context menu
reduce Windows MIDI hardware output jitter
import type 1 MIDI files with channel data in the tempo track .
New in Version 5
Notation editor: NEW in 5.20 - Compose and edit MIDI as musical notation, or view and edit recorded MIDI. Flexible mouse editing, key signatures, multiple clefs, dynamics, voices, lyrics, tuplets, articulation, ornaments, slurs, and more.
FX:VST3 support, sample-accurate automation for VST3 and JSFX, FX browser improvements.
ReaScript:API and scripting improvements, including a built-in development environment for creating and debugging scripts in Lua, EEL, or Python. Create anything from simple macros, to complex new functionality.
Control grouping:Flexible, automatable VCA control. Link groups of track controls together at any point in the signal flow.
Video:Many improvements to video support and performance, including real-time programmable track and item effect processing.
FX parameter automation:Full automation and MIDI/OSC learn support for per-take FX, improved FX envelope and modulation management via the Project Bay, increased automation recording speed.
And more:New GUI layouts, Media Explorer improvements, metronome beat patterns, Opus support, MIDI note-off editing, new volume envelope modes, new actions and API functions, and many other fixes and improvements.

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