Reducing bit depth is generally the last step in delivery, after sample rate conversion. When reducing the bit depth for the destination format, the application of dither noise prevents distortion and quantization error. Compared to some long-standing dither algorithms, Goodhertz Good Dither produces better noise reduction without excessive noise shaping. Good Dither also has a wider, flatter noise reduction region which contributes to higher performance in the most critical areas.
When using the Change Bit Depth Action, you'll see the following controls:
Bit Depth: The desired bit depth.
Noise Shaping: The noise profile of Good Dither. The "Low" and "Flat (Type II)" options will have the least drastic curves but lower overall dither noise reduction. Setting the shape to "Optimal" provides a nice balance between the noise shaping curve and dither noise reduction for any combination of bit depth and sample rate.
Amount: The amount of dither noise applied.
Auto Blanking: When enabled, the dither noise is muted when the input is silent.