VST stands for Virtual Studio Technology. There are three types of VST plug-ins:
Another option to run VST and AU plugins in the full version of Pro Tools 12 is with the Blue Cat Audio Patchwork plugin. It’s capable of hosting up to 64 VST, VST3 or Audio Unit plugins in one instance. It sells for $99 (79 euros). Pro Tools 12 and Metaplugin – Wes Renaud. Spice up your DAW with some new plug-ins! If you're a little nonplussed by the concept of plug-ins or how to install them to Pro Tools, check out this step-b.
VST plug-ins can be used within a digital audio workstation, in programs like Pro Tools and Logic. They’re frequently used to emulate hardware outboard gear such as compressors, expanders, equalizers, and maximizers. You'll frequently find these distributed to emulate certain models of hardware; there's some for vintage compressors, and you'll frequently find effects that emulate vintage hardware (both in instrumental and stompbox-like effects).
Think of VST plug-ins as really affordable ways to make your home studio sound like a really expensive commercial operation.
Aside from VST plug-ins, you'll also find VST-instrument or VSTi plug-ins. These can emulate really cool, but expensive, hardware (like Hammond B3 and Nord Electro). The quality of these VSTi plug-ins can vary from acceptable to really poor; it all depends on the quality of your system resources (RAM and scratch space on your hard drive, for example), and how well-sampled the instrument is. You also want to make sure that your VSTi plug-in offers true polyphonic content, meaning you can make life-like chords that don’t sound too artificial.

There are thousands of plug-ins available. Some only take a few hours to produce and are free, but the quality is terrible. Some are made by huge companies and sound amazing, but are expensive. VST plug-in developers try to recreate the sound as closely as possible, but the original instrument is probably always going to sound better than the plug-in. You might be trying to get the rich, full-bodied sound of an organ, for example, but who owns an organ? No one has access to every type of instrument, so a plug-in will have to do. The good news is that VST plug-in technology is improving, so quality can only get better with time.
Created by Steinberg, a German musical software and equipment company, the VST plug-in standard is the audio plug-in standard that allows third-party developers to make VST plug-ins. Users can download VST plug-ins on Mac OS X, Windows, and Linux. The vast majority of VST plug-ins are available on Windows. Apple’s Audio Units are standard on Mac OS X (it’s actually considered a competing technology), and Linux lacks commercial popularity, therefore few developers create VST plug-ins for the operating system.
There are thousands of VST plug-ins available, both commercially and as freeware. The Internet is flooded with free VST plug-ins. Home Music Production and Bedroom Producers Blog have robust lists of VST plug-in recommendations, and Splice and Plugin Boutique also offer a ton of free plug-ins.
There are a few different way to use VST and AU plugins in Pro Tools 12. It’s even possible to use VST/AU plugins in Pro Tools First, the free version of Pro Tools 12.
One of the things that separates Pro Tools from other DAWs is the proprietary AAX format that it uses for plugins.
Not all plugins are available in AAX, especially some really good free ones, so Pro Tools users have to find workarounds to get their favorite VST and AU plugins to work.

Luckily there are a few methods that can get the job done.
Unfortunately none are free, but they all have demos to try for free, and each offers a number of other features as well.
Not all of these options will work with Pro Tools First since one of the main limitations with the free version is you have to get all the plugins through Avid’s marketplace.
Pro Tools First does supports ReWire, though, and that’s a big plus because that means it can run other DAWs that support ReWire. It can use Ableton Live’s built-in instruments, for example, and if you ReWire with Reaper it can run VST plugins within Pro Tools. Bidule is another option that works with Pro Tools First.
Reaper is a good option to use VST plugins in Pro Tools because it has a 60-day free fully-functioning demo and it only costs $60 to purchase. Plus it’s a full DAW and not just a plugin like the other options.
The folks at Pro Tools Expert uploaded the helpful video above showing how to use Bidule with ReWire to load VST instruments into Pro Tools First. Bidule sells for $95 and can be used for a number of other things as well.
Another option to run VST and AU plugins in the full version of Pro Tools 12 is with the Blue Cat Audio Patchwork plugin. It’s capable of hosting up to 64 VST, VST3 or Audio Unit plugins in one instance. It sells for $99 (79 euros).
The Metaplugin is an AAX plugin that can host VST and AU plugins in the full version of Pro Tools. It supports up to eight individual channels and sells for $49.