If you want to dither in Soundforge you have to add the Sony Dither plug in the plugin chain then render the file.  I think doing a "save as" will also apply any FX in the plugin chain.

Very good points. Don't sell Sonar Platinum short here. It has a number of dithers. Each should be tested for the sort of stuff you do. 
 
Below is from the manual on dither. 
 
Dithering
Dithering. Whenever an audio signal is converted from a higher-bit resolution to a lower resolution, it is
necessary to apply dither to avoid introducing undesirable quantization noise or harmonic distortion into the signal.
The purpose of dither is to reduce the resulting distortion by adding low-level random noise or “dither” to the audio
signal. Different mathematical calculations are used to generate dither, each method has advantages and
disadvantages depending on the particular operation. SONAR features the Pow-r dithering process, short for
Psycho-acoustically Optimized Wordlength Reduction, which can produce lower-bit files that sound
indistinguishable from higher-bit source files. When this option is turned on, SONAR uses dithering when you
export a higher-bit file at a lower resolution, or lower the bit depth of a project’s audio files by using the Utilities >
Change Audio Format command, or when you “render” audio (bounce, freeze, or apply effects).
SONAR offers five kinds of dithering:
Rectangular. Essentially white noise, no noise shaping. Advantages: least CPU-intensive, lowest signalto-noise ratio, preferable to shaped dither when successive dithering can occur (e.g. bouncing, freezing).
Disadvantages: suffers from intermodulation distortion, higher perceived loudness than Pow-r dither.
Triangular. Higher level than rectangular, no noise shaping. Advantages: low CPU-intensive dither,
superior to Rectangular as it does not suffer from modulation noise effects. Preferable to shaped (Pow-r)
dither when successive dithering can occur (e.g. bouncing, freezing). Disadvantages: higher perceived
loudness than Pow-r dither.
Pow-r 1 (Platinum only). Noise-shaped dither. Advantages: less CPU-intensive than Pow-r types 2 and
3, lower perceived loudness than Rectangular or Triangular. Disadvantages: less noise shaping than Pow-r
types 2 and 3, not recommended for operations where dither will be applied successively (e.g. bounce and
freeze).
Pow-r 2 (Platinum only). Noise-shaped dither. Advantages: lowest perceived loudness, highest quality
settings, recommended for audio export. Disadvantages: highest CPU-intensive settings, not
recommended for operations where dither will be applied successively (e.g. bounce and freeze).
Pow-r 3 (Platinum only). Same as Pow-r 2 except most CPU-intensive and transparent of all choices.

Sometimes we take SONAR's "under the hood" features for granted (and there are quite a few of them). That Soundforge dither "issue" still bothers me (if true) for something up to version 11 - it seems to bear no logic and would provide massive pitfalls to an unwary user.

re SoundForge -- if the ordinary path causes a worse result, then that's either a bug or a design failure. 
 
Hem.   Same with Sonar. 

It's not really as simple as worse / better though. I may or may not choose to dither something, and I may or may not to choose to save it in a different bit depth. Depends what I'm trying to achieve.

Anderton

kevinwal

ampfixer
How are Soundforge and Pro Channel related? 

I think SoundForge is married to Pro Channel's brother's sister.

 
Yes. And if I recall, it was quite the scandal at the time because it was the first inter-bit marriage. Sound Forge could only go to the 32-bit restaurants, and had to sit at the back of Aux Bus. When ProChannel tried to bring Sound Forge into a 64-bit bar, they were greeted with a "We don't serve your kind here." But the two persevered, to the point where eventually the world came around to accepting 64-bits and even inter-bit marriages. From what I understand, Sound Forge is even integrated in many SONAR Utilities menus. Once again, SONAR was ahead of society at large.

It is good to see everyone built a Bit Bridge and got over it in the end,