The counterpart to your new upsampling feature: How about a way to run given plugins at .5fs? Some plugins really don't like high sample rates. The TTS-1 is a good example. It screws up bad at 96kHz and won't run at all at 88.2kHz. However, if I could run it at half the sample rate, it would then be usable in an 88.2kHz project.
 
I'd much rather run a project at a higher rate so that everything is being oversampled (since as you note some plugins that lack internal oversampling benefit from it) and only tag the one or two plugins I have that can't handle it than fun a project at a normal sample rate and have to test and see which plugins I need to flag for oversampling.
 
It would be cool to just see it as a selection you can choose regardles of host sample rate: Run the plugin at 1xFs, .5xFs, or 2xFs and maybe even .25xFs and 4xFs.

FWIW, TTS-1 runs fine at 96kHz. It does require setting "Light Load Mode" every session.

That said as currently implemented, the upsample feature only works during fast rendering. There is no ability to play in real time. I would think real time resampling would need to be implemented first.

What does "Light Load Mode" do?
 
And thanks, I was wondering why it supported 96kHz operation but was all messed up sound wise.

IDK, other than make the plug-in work at 96kHz

WRT downsampling have you tried specifying the sample rate in aud.ini see the 
"Upsampling settings" section in http://www.cakewalk.com/D...mp;help=Mixing.25.html

Indeed you can set any sample rate there upto 384K - the code doesn't restrict it to upsampling.