The patches are still there at the wayback machine.
They are hidden in the source code of the pages!
Just open the source of the page and look for these strings:
At the original toneroom site these parameters were streamed to a flash script which transformed them into a display of the knob settings. This flash script does not exist anymore, so you do not see the parameters or their visualization. http://www.voxamps.com/assets/toneroom/valvetronix_plus.swf
Probably a flash script for a Vox ToneLabST also will help, because it has almost the same sound engine with the same settings.
Also there exists a free software editor for the ToneLabST, that is written in Java: http://sourceforge.net/projects/stlab/
, home page: http://robig.net/wiki/index.php?wiki=EnStLab
Perhaps the sourcecode can be adjusted to read and visualize VTxx+ patches.
The parameters of the patches are still there at the wayback machine and can be copied from the source code.
One has to have a look at some patches to find out what the parameters mean.Also it will help significantly when some can provide a screenshot of panel settings of any patch which we than can compare with the settings that are stored in the page of that patch.
In addition you should use the last backup of the toneroom site
at the wayback machine (2012-12-19). It countains 21 pages of preset patches (>300 patches):https://web.archive.org/web/20121219151828/http://www.voxamps.com/toneroom/browse/hardware/valvetronix-plus/1/
Edit: 2015-01-13: added some links