Does MaxMSP support plug-ins for other audio programs?
Yes. MaxMSP contains an object called vst~ which lets you load a VstPlugin. Plug-ins in MaxMSP can be more interesting than the way sequencers use these plug-ins. For instance, you could load ten plug-ins and assuming you had the CPU power to do it, run them all in parallel. Or, using Max, you could generate algorithmic automation control over several plug-in parameters at once. You can also use VST instrument plug-ins and send them MIDI events, as well as ReWire devices.