Sample rate slide? What are you talking about? 
Are you talking about sliding notes when using VSTs? If yes then check this thread. You’ve got 3 options.
Or do you want to manipulate specific values of a VST instrument? If yes then use the Instrument Automation device. You can do quite the same with plugins than with samples, but you can’t do it the same way. Pattern effect commands usually affect samples only. If you want to do the same with plugins you will have to automate stuff.