I haven't tested this extensively, but so far very good! This works with the Sonitus effects, 64-bit DXi instruments, the Cakewalk Creative Suite effects, etc. As a bonus, if you have a Sony product like Vegas installed, its DX plug-ins show up too.
 

 
So here's the deal...this assumes a 64-bit OS and 64-bit Studio One Professional.
 
1. Go to https://www.xlutop.com/buzz/zip/
2. Download the zip file dxshell_v1.0.4b.zip
3. Extract it.
4. Copy the files dxshell.x64.dll and dxishell.64x.dll to the folder where Studio One looks for VST plug-ins.
 
That's pretty much it...open Studio One, and you'll see all the 64-bit DX and DXi plug-ins...this includes Groove Player, Cyclone, SFZ, Z3TA+, PSYN II, and...wait for it...the TTS-1!

Cool tip Craig. Thanks.

Awesome

Thanks!  Are dxshell.x64.dll and dxishell.64x.dll specifically written for Studio One?  Still nice tip if they aren't.  

Looks like this would work with Cubase too, will try and test it later

Nice find, Craig
All the best.

This works in Samplitude Pro X3. They all show up, they all work -- except for the Sonitus Compressor. Output is garbled and distorted for that one, no idea why. But so far, the other Sonitus ones I've tested all work fine - Reverb, Phaser, Multiband, Delay...

I'll also test with some other programs later...curious of this will work with Ableton Live.

bwbalint
Thanks!  Are dxshell.x64.dll and dxishell.64x.dll specifically written for Studio One?  Still nice tip if they aren't.  

No, these are from 2012 and are intended for any programs that work with wrappers. That included Cubase at the time, so presumably they still work.

Amicus717
This works in Samplitude Pro X3. They all show up, they all work -- except for the Sonitus Compressor. Output is garbled and distorted for that one, no idea why. But so far, the other Sonitus ones I've tested all work fine - Reverb, Phaser, Multiband, Delay...

If there is still one Sonitus plug I use to this day it's the Compressor. Bummer.