This is portable version of REAPER. Cockos REAPER is a powerful but sensible Windows application that lets you record, arrange, edit, and render multi-track waveform audio. It provides an extensive set of features, but is a very small and lightweight application (the installer is less than 1 megabyte, and includes many effects and a sample project).
► Basic features:
Portable – supports running from USB keys or other removable media
64 bit audio engine
Excellent low-latency performance
Direct multi-track recording to many formats including WAV/BWF/W64, AIFF, WavPack, FLAC, OGG, and MIDI.
Extremely flexible routing
Fast, tool-less editing
Supports a wide range of hardware (nearly any audio interface, outboard hardware, many control surfaces)