As far as i see now studio supports using only one VST plugin at a time that can be added to any particular tack, but only at one track.
Hello. Yes, you are right, currently, Amped Studio supports Vst, which is great, but a VST plugin can be added only to one track at a time, and only one VST, for example, if there is a VST already added in the device chain of Track 1, adding a VST in the device chain of Track 2 will, turn the first one off. Or if there is a VST already added in the device chain of Track 1, and you are willing to add a second one so the first will be off then.