Studio One Professional ships with 32 64-bit Native Effects™, and both Studio One Producer and Artist ship with all but 5 of these plug-ins (Pipeline, Groove Delay, Multiband Dynamics, OpenAIR, IR Maker). Click here for a complete breakdown.
Studio One Professional and Producer also support VST 2.4, VST 3, AU, and ReWire. No version of Studio One imposes limits on the number of plug-ins that can be used in a given Song. You’re limited only by your computer.