Assuming you have Visual Pinball setup already on PinballX. Here is how I added a second version of VP.
EDIT: Also read htamas' post below as it uses same approach but he has confirmed that making a copy of the VP folder is not necessary.
I setup Pinballx Visual Pinball to run VP9.9. I then created a new "Visual Pinball DX7" folder and copied the entire VP folder there except the vPinMame folder. I use this to play tables in VP9.2.1
Run PinballX Settings.exe, navigate to Other Systems page and create a new System entry (I used System 2)
In C:\PinballX\Databases folder, create a folder using the System Name above. In this example: C:\PinballX\Databases\Visual Pinball DX7
In this folder, create an xml file based on the system name also, C:\PinballX\Databases\Visual Pinball DX7\Visual Pinball DX7.xml
Now just modify the original VP xml file and this xml file to contain the tables you to play with each VP version
Delete the unused tables from each VP install folder to save space
Just played T2 Chrome edition on 9.2.1 when I was checking this. Man, that table is beautiful. Thanks Tipoto!
DX9 Table Compatibility issue list here: https://docs.google....p=sharing#gid=0
DX9 Table Upgrade Guide: https://github.com/c...e-Upgrade-Guide
Edited by gtxjoe, 26 July 2014 - 11:08 PM.