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GuitarFlex vs Vir2 Electri6ity and Acou6tics

Electri6ity and Acou6tics are Vir2 Instruments' two guitar libraries, for Kontakt Player: eight sampled electric guitars and six acoustic instruments, at $399.95 each. GuitarFlex is modeled, not sampled: presets for steel-string and nylon-string acoustic and electric clean, crunch and heavy guitars in one program, a download of 18.2 MB, and $79.

What they have in common

Acoustic and electric guitars you play from MIDI, note by note.
Nylon and steel-string acoustics. Acou6tics has a steel-string and a nylon guitar, and GuitarFlex has presets for both.
Pickup choice. Electri6ity has three pickup options per guitar, and GuitarFlex has a Pickup panel.
Amp, drive and EQ. Electri6ity has an Effects page with amp styles, drive and EQ. GuitarFlex has a Cabinet panel, a reverb and an eight-band EQ, and an Amp panel with voices from clean to high gain.

Where Electri6ity and Acou6tics stand out

More guitars. Electri6ity has eight electric guitars, with more than 24,000 24-bit samples of each. Acou6tics has six instruments: steel-string, 12-string, nylon, mandolin, guitalele and ukulele.
Instruments beyond the guitar, including a mandolin and a ukulele.
Strum controls and key switches. Acou6tics has strum direction, strum speed and pick position controls, and a key switch page. GuitarFlex has no keyswitches and no strum patterns.
Recorded instruments, where GuitarFlex plays no recordings.

Where GuitarFlex stands out

$79, against $399.95 for each of Vir2's libraries, which are sold through Big Fish Audio.
No other program. Vir2's libraries are built for Kontakt Player. GuitarFlex runs on its own, as a standalone program and a VST3 plugin.
A stated size. GuitarFlex is an 18.2 MB download that installs at 43.9 MB.
No account and no online activation. A license key and your email address, entered once for each Windows user on each computer, and one license for one person, to use on all of their own computers. It never connects to the internet.
A demo you can download and try before you buy.
Your own settings. Over 70 sliders and four slots (A to D) to switch between sounds or layer them, with Compare, Vary and Randomize.
Your song to a file. It renders a MIDI file to FLAC, or to WAV with the included command-line renderer.
Built to play ComposerFlex's band, our songwriting program, on the same PC with no setup. Strums and articulations come from ComposerFlex; from a keyboard or a MIDI file it plays the notes as written.

Which to pick

For a larger set of electric guitars, or for mandolin, guitalele and ukulele: Vir2.
If you already use Kontakt Player and want strum controls and key switches: Vir2.
For one small program with electric and acoustic guitars at $79: GuitarFlex.
If you'd rather have no account, no online activation and one license for one person, to use on all of their own computers: GuitarFlex.

Owning both

If you already own Vir2's libraries, GuitarFlex can sit beside them as a guitar that plays ComposerFlex's parts. Vir2's pages have older material, so check its current system requirements, size and license terms on vir2.com before you buy. GuitarFlex's demo is here. This page doesn't compare how they sound. That's for your ears.

The facts side by side

Every fact about Vir2 Electri6ity and Acou6tics is from Vir2 Instruments' own pages, checked on 7 November 2026. Prices are list prices in US dollars; sales come and go.

	GuitarFlex	Vir2 Electri6ity and Acou6tics
How it makes its sound	Modeled. It computes every note as you play, from the physics of plucked strings: the acoustic presets sound through the guitar's body, and the electric presets through a pickup, an amp and a cabinet. It plays no recordings.	Sampled: eight sampled electric guitars, with more than 24,000 24-bit samples of each, and six recorded acoustic instruments (the maker's words).
Price	$79, one-time	$399.95 each, as the maker's product pages show it (sold through Big Fish Audio, whose shop page could not be read)
Download and disk space	18.2 MB download, 43.9 MB installed	Not stated on the maker's pages
Memory the maker asks for	4 GB, with 4 cores or more and 100 MB of disk (the minimum we state for every Flex program)	Not stated on the maker's pages
Runs on	Windows 10 and 11, 64-bit	Not stated on the maker's pages
Forms	Standalone and VST3	Built for the Kontakt Player; formats not stated
Needs another program	Nothing else	The free Kontakt Player
Copy protection	A license key and your email address, entered once for each Windows user on each computer. No account and no online activation.	Add the library in Kontakt Player, press Activate, log in to a Native Instruments account and enter the serial number (the maker's FAQ)
Computers per license	One license for one person, to use on all of their own computers	Up to 3 computers with the same serial number under the same Native Instruments account (the maker's FAQ)
Demo	A demo to download and try before you buy	Not published
Guitars included	Presets in groups: steel-string and nylon-string acoustic, electric clean, crunch and heavy, and a two-guitar band preset; four slots to layer sounds	Electri6ity: eight sampled electric guitars with three pickup options each, and pages for performance, settings, effects (amp styles, drive, EQ) and fretboard. Acou6tics: six acoustic instruments (steel-string, 12-string, nylon, mandolin, guitalele and ukulele), with strum direction, strum speed and pick position controls, a key switch page, automatic chord voicing and 156 MIDI strumming pattern files as a separate download

More: virtual guitars compared: modeled and sampled, a table of 25 products, and all about GuitarFlex.

If something here is out of date, write to [email protected] and we'll correct it.

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