This is the system James is talking about, I'm surprised he hasn't mentioned it 
in his posts:

http://ringengineering.com/index.html

Not quite a "pure" variable DC system, being that its a radio-based system 
using a fixed DC voltage.  (The same thing TMCC does with AC.)

Rich G(ajnak)

--- In [email protected], Pieter Roos <pieter_roos@...> wrote:
>
> Hi James;
> 
> I'm assuming you mean DCC sound, since there are no real "systems" for sound 
> under straight DC (although some DCC sound decoders will produce a minimal 
> subset of sounds under DC).
> 
> In HO, Mike's Train House offers trains with their proprietary control system 
> which will operate under DCC. So sound systems are somewhat compatible 
> between DCC and DCS (the MTH system). I don't see why Mike's would abandon 
> this for SHS trains. This leaves Lionel as the outlier, but they have already 
> discussed adding some level of DCC compatibility.
> 
> For that matter, Lionel TMCC/Legacy and MTH DCS are control systems similar 
> in concept to DCC, just proprietary rather than a common standard as DCC is. 
> It isn't quite like going back to Lionel/Gilbert AC with the 
> forward/neutral/reverse sequence.  
> 
> Pieter E. Roos
> 
> --- On Fri, 8/24/12, JAMES SLEETH <aztecfan@...> wrote:
> 




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