Radius from iZotope adds additional high-quality time-stretching and pitch-shifting processing to Apple's Logic Pro and Soundtrack Pro audio applications. Once installed as an option within the software, you can easily change the pitch of a single instrument, voice, or entire ensemble while preserving the timing and acoustic space of the original recording.
Radius is designed to match the natural timbres of a sound even with extreme pitch shifts, and allows you to change the tempo without affecting the pitch or tone of the performance. Instrument attacks, percussive hits and the sound stage remain untouched, even at extreme stretches. The software is also able to preserve transients and sustained material at the same time.
For example, when stretching a recording with sustained brass and pizzicato strings, Radius preserves the continuity of the brass notes, as well as the timing and attack characteristics of the strings. Furthermore, Radius is designed for completely transparent operation on a wide variety of source material with nearly automatic operation. It is well suited for both commercial studio applications and home studio use.
Radius features two modes of operation- Mix and Solo mode. Mix mode is designed to work well with polyphonic material such as mixes with more than one instrument, as well as non-harmonic material such as drum loops. Solo mode works best with a single harmonic instrument such as a stringed instrument or the human voice. For finer control, use harmonic correction to manipulate the timbre.