Hi abacus.
You can use 1 ASIO host for each soundcard, (Or 2 if you add ASIO4all) thus with one soundcard you can run 2 standalone VSTi.
That's a far cry from what you were saying in your last post where there was no difference between the Windows and Linux functions when it comes to the ability of Jack.
There's a huge difference. The One ASIO HOST per sound card does not apply to Linux, that's a limitation of Windows.
ASIO4all is by no means a solution either. It's nothing other than an emulation of ASIO that drives up CPU usage in a big way depending on what VSTi you use. You can also only run one instance of it too.
By adding the Jack program you can use multiple standalone applications simultaneously with just the one ASIO host.
I think your getting confused here as to what the function of JACK is. JACK is not a multi host application. Neither is Energy XT from what I see. There is nothing on their website to suggest that they have overcome the problems assiated with Windows in this regard.
Lionstracs edge is not just Linux version of JACK over a Windows version, it's the Linux OS itself that gives you the ability to do so much more in JACK under Linux VS Windows.
Regards
James