Does Renoise support older VST SDK2.1 plugins?
A lot of pre 2.4 stuff has deprecated functions.
I don’t know if Renoise does support them, the best way to find out is just trying them out. I know some VST plugins that worked fine on Windows XP do not work at all on a 64-bit windows architecture in any host. (Not even bridged)
But if old vst plugins do not work in the latest Renoise versions, you can still download and install an archived copy of Renoise which does.
Which fossil plugin you desire to use with Renoise?
Yes, it does.