assuming you're asking for the Windows VST (yeah, you said ".dll") you may not use it under qtractor unless take the extra chores to using a so called Windows-to-Linux VST bridge or wrapper, almost all of them relying on Wine to get the hack through...
lest to say, this is not the best forum to deal with this matter--qtractor is a Linux only, remember?--but you can search the interwebs for some VST bridges people have been trying out there (with mixed results, mind you, YMMV): DSSI-VST, FST, LinVst, AirWindows, and probably the swiss-army-knife-for-plugins-in-linux-and-everything-else which is Carla ;)
hi,
assuming you're asking for the Windows VST (yeah, you said ".dll") you may not use it under qtractor unless take the extra chores to using a so called Windows-to-Linux VST bridge or wrapper, almost all of them relying on Wine to get the hack through...
lest to say, this is not the best forum to deal with this matter--qtractor is a Linux only, remember?--but you can search the interwebs for some VST bridges people have been trying out there (with mixed results, mind you, YMMV): DSSI-VST, FST, LinVst, AirWindows, and probably the swiss-army-knife-for-plugins-in-linux-and-everything-else which is Carla ;)
hth.
cheers