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. iZotope Radius is designed to preserve natural timbres even with extreme pitch shifts.

iZotope Radius 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.

Using an advanced hybrid method, iZotope Radius is able to preserve transients and sustained material at the same time. For example, when stretching a recording with sustained brass and pizzicato strings, iZotope Radius preserves continuity of the brass notes as well as the timing and attack characteristics of the strings

Video post production: fit soundtrack, voice over, and other audio cues to video clips


Shift pitch up or down to match a vocal or instrumental range for practice, performance, or recording


Sound design: extreme distortion-free time-stretch and pitch-shift effects


Pull-up and pull-down for film and video conversion


Slow down recordings for spoken dictation, musical transcription, or for practicing at slower tempos

Radius features two modes of operation, Mix mode and Solo mode, combining the best of time domain and frequency domain vocoder methods.

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.

Combined with extensive formant correction options, full parameter automation, stereo image controls, and quality/performance tradeoffs, iZotope Radius is the most fully-featured and the highest quality time compression/ expansion (TC/E) algorithm available today.

Time stretch between 12.5% and 800%


Pitch shift from -36 to +36 semitones


Maintain original acoustic space and sound stage


Preserve transient attacks and timing accuracy


Apply formant correction with strength and shift control


Preserve Dolby matrix encoding


Maintain phase coherency and preserve stereo image


Supports sampling rates up to 192 kHz

For more information on incorporating iZotope's technology into your application or device, please submit your contact information and a short description of the project.

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