iZotope 64-Bit SRC

Sound Forge Pro b SRCResample iZotope 64 Bit SRC

Process Menu

From the Process menu, choose Resample, and then choose iZotope 64-Bit SRC from the submenu to change the sample rate of an existing sound file.

For more information about using processing dialog controls, click here.

  1. From the Process menu, choose Resample, and then choose iZotope 64-Bit SRC from the submenu.

  2. Choose a setting from the Preset drop-down list, or adjust the controls as needed.



New sample rate

Specify the sample rate to which the sound file will be converted.

Sound Forge Pro note iZotope 64 Bit SRCIncreasing a file’s sample rate cannot improve the quality of the existing audio, but does allow higher resolution for processing.


When the Use simplified Quality setting check box is selected, you can drag the Quality slider to adjust the plug-in’s controls automatically.

Dragging the slider sets the balance of audio quality vs. processing speed. A setting of 50% works well for most applications. Increasing the setting improves the quality of the plug-in but requires more processing power.

When the Use simplified Quality setting check box is cleared, you can adjust the plug-in’s controls manually.


The plug in uses a low-pass filter to discard frequencies that cannot be represented or are undesirable in your audio output.

This setting establishes the steepness of the transition band of the low-pass filter. Higher settings will reject unwanted frequencies, but can cause more ringing in the time domain and a higher CPU load.

Max filter length

Sets the maximum length of the filters used for resampling.

The default setting will work well for most applications, but you can increase the setting if very high-quality output is desired for uncommon source or destination sampling rates.

Cutoff scaling

Allows you to scale the cutoff frequency of the plug-in’s low-pass filter from the Nyquist frequency.

Typical values are near 1. Higher values will offer a flatter pass-band, and lower values will offer better aliasing suppression.

Alias suppression

Sets the amount of suppression in the low-pass filter’s stop-band. Frequencies in the stop-band that are not fully attenuated will result in aliasing.

Higher settings will result in better quality, and lower settings can minimize CPU load.


Low-pass filters are characterized by the amount of ringing they introduce into their output. Higher Steepness settings produce increased ringing.

A setting of 100% produces a linear phase filter with equal pre and post ringing. A setting of 0% produces a minimum phase filter that offers no preringing but has nonlinear phase distortion. Intermediate settings allow a tradeoff between preringing and  postringing and allows you to linearize phase in the pass-band.

Set the sample rate only (do not resample)

Select this check box to change the playback rate without resampling the data. This means that the original pitch of the file is not preserved.

  1. Click OK.

iZotope 64-Bit SRC