Use Vst Plugins With Guitar Rig 5 Player
You may not be aware but Native Instruments, makers of cool hardware and software, have a free range of some of their flagship plugins. All these plugins are both PC and Mac VST and AU so will work with Studio One.
GUITAR RIG 5 is now loaded after an instrument on a MIDI track or on an audio track. The plug-in's user interface will automatically open for editing the instrument's parameters. To show or hide the plug-in in a floating window, press the Plug-in Edit button in the Guitar Rig 5 device pane. Guitar Rig 5 Pro is their flagship product in the amp simulator space with the Guitar Rig Player offering a free alternative with some basic functionality. Amps and Effects Library: All the usual suspects from Marshall, Fender, Orange, Peavey and Mesa Boogie are available – up to 27 amps.
Check them out, they are very powerful and should be considered as part of your production arsenal.
REAKTOR 6 PLAYER
REAKTOR 6 PLAYER is the free host for all KOMPLETE Instruments powered by REAKTOR.

KOMPLETE PLAYERS

Three powerful playback engines, 600 MB sounds for free. Includes KONTAKT 5 PLAYER, REAKTOR 5 PLAYER, and GUITAR RIG 5 PLAYER.
KONTAKT 5 PLAYER
Free sample player with a basic sound library, instantly expandable with the growing range of 'Powered by KONTAKT' instruments.
GUITAR RIG 5 PLAYER
Free, expandable effects engine with one amp, 17 cabinets and 13 effects and modifiers. Super-easy to use, hosts all KOMPLETE Effects.
MIKRO PRISM
Guitar Rig 5 Player Download
Free, fully-playable instrument with a stunning range of brilliant sounds, based on the innovative synthesizer REAKTOR PRISM.