Hello. I ran into the same problem today. I had VDMSound 2.0.4, but I decided to upgrade to VDM 2.1.0 Beta. After installing, the program I sometimes use to launch old games with ease, Abandon Loader ( http://www.angelfire.com/realm/zeroone/ ) stopped seeing VDMSound. 😢
From what I know, and I don't know much, there is no way of pointing Abandon Loader to VDMSound, it simply sees it. Or it used to. Even after I uninstalled 2.1.0b, reinstalled 2.0.4 AL wouldn't see VDMSound anymore. Doesn't matter how many restarts, uninstall-restart-install-restarts, no matter which version of VDMSound I go to, nothing. It seems completely gone. 😵
What to do now? 😅
Thanks in advance.