Opening the iTunes Store.If iTunes doesn't open, click the iTunes application icon in your Dock or on your Windows desktop.Progress Indicator
Opening the iBooks Store.If iBooks doesn't open, click the iBooks app in your Dock.Progress Indicator

iTunes is the world's easiest way to organize and add to your digital media collection.

We are unable to find iTunes on your computer. To buy and download Crystal Synth XT by Green Oak Software, get iTunes now.

Already have iTunes? Click I Have iTunes to open it now.

I Have iTunes Free Download
iTunes for Mac + PC

Crystal Synth XT

By Green Oak Software

Open iTunes to buy and download apps.


Crystal Synth XT is a full featured semi-modular synthesizer, ideally suited to creating lush evolving soundscapes. Crystal VST has long been a popular synthesizer on the desktop. Crystal XT brings that same powerful synthesis engine to the iPad and iPhone. Crystal XT features MIDI keyboard input via the iPad's camera adapter or any CoreMIDI-compatible MIDI interface such as the Line 6 MIDI Mobilizer and sharing of sounds with the desktop version of Crystal.

== Features ==
Browse through the included sounds and use the 2 octave keypad to trigger notes to produce evolving, rhythmic, or melodic sounds. Create your own sounds with a single button press using the breed feature. When using an iPad, you can delve into a tweaker's dream by using the extensive editing features to sculpt sounds to your heart's content (editing features are only available when used on an iPad).

Crystal features both subtractive synthesis and frequency modulation (FM) synthesis. It offers abundant modulation control with over 90 parameters which may be modulated, multi-stage envelopes with graphical editors, extensive tempo sync of envelopes/lfo rates/delay times, built-in effects for chorus/flanging/comb filtering/echoes, and a band splitter for effects processing by frequency band. Not only that, Crystal has wave sequencing and granular synthesis. The musical applications for Crystal are literally boundless.

== MIDI ==
With MIDI keyboard input, you can connect a MIDI keyboard to your iPad and play Crystal XT like a hardware synth. Or use a CoreMIDI-compatible MIDI interface such as the Line 6 MIDI Mobilizer and connect your MIDI keyboard to Crystal XT on an iPhone.

== Virtual MIDI ==
Use virtual midi to play Crystal from a midi controller app. Use the Settings app to turn on the CrystalSynthXT Background Audio mode to enable Crystal to play audio when in the background. You can then play Crystal from a midi controller app which supports virtual midi.

== Sharing ==
With patch sharing you can create sounds on your iPad or iPhone while away from the studio, then transfer them to the desktop Crystal when you get back to the studio to use in recording projects. Or, create banks of sounds on the desktop Crystal, then transfer them to the iPad/iPhone Crystal to use in a live performance for a truly portable rig. Use Audio copy/paste to record your performance on Crystal and transfer that performance to another app. Or copy your recorded performance to your computer.

== Audiobus ==
To use with Audiobus, use the Settings app to turn on Background Audio for Crystal Synth XT.

== Different Versions ==
If you don't need all the features of Crystal XT, try the basic version of Crystal, also available in the app store from Green Oak Software. With the basic version you can browse sounds, play notes, and create new sounds, taking advantage of its powerful semimodular synthesis engine. Crystal XT adds MIDI keyboard input via the iPad's camera adapter and sharing of patches with the desktop version. Choose the app that is best for you!

== Notes ==
Important note for iPhone and iPodTouch users: Crystal XT runs on both the iPad and the iPhone. Because of the limited screen space on the iPhone however, the editing pages, which contain the edit controls, are not available when running on that device. But on the iPhone you can still browse sounds, play notes from the keypad, create new sounds with the Breed feature, modify patches with the Design feature, and share sounds with desktop Crystal VST.

MIDI input via Apple's camera adapter requires an iPad. Apple's camera adapter is not supported on the iPhone/iPod Touch. On the iPhone/iPod Touch use CoreMIDI-compatible MIDI interface such as the Line 6 MIDI Mobilizer to connect your MIDI keyboard to Crystal. We recommend as a good place to go to learn whether specific keyboards will work with the camera adapter.

For videos and information about Crystal XT, visit:

What's New in Version 2.1

Added MIDI Input Selector. MIDI device and channel may now be selected. Also fixes a display problem with pop up menus on iPhone6. Positive reviews are always appreciated! Please send any problem reports via email to We cannot reply to problem reports in reviews.


iPhone Screenshot 1
iPad Screenshot 1
iPad Screenshot 2

Customer Reviews

Excels at Pads and Atmospheres

Also excels at evolving rhythms and drones. This is an iPad "classic" app with plenty to explore.

One ov thee Many reasons........

.....the NWO is destined for failure .

Power House, with Ultimate Control... Nothing Even Comes CLOSE!

Since the original release of Crystal VST, from Green Oak Software (back when Windows XP was the flag ship!) I was hooked, I entered one of my presets for the contest, and have used this Synth as an inspiration for songs that I have recorded in the studio!
I love this app but I have ONLY ONE ISSUE that I wish Green Oak would maybe look into, and that would be an easier way to get presets saved to Dropbox and a way to bring "Widows versions" of presets back into the app.
Could their possibility be a menu that would open and show the files on drop box and a way to select the presets you wish to transfer?
I love this app and I have given many 5 star reviews (here as well as every VST website I can find,) I recommend it to every musician I know!
It's an amazing tool that even if you are NEW to Soft Synths you have an area that you can MORPH two presets that you like INTO ONE BRAND NEW PRESET! Choose a preset to be the "Father" and another preset to be the "Mother" hit the BREED button, and you have your very own preset to NAME! The MODULATION MATRIX is the staple that sets this synth apart, you can filter on the TONS of tones and samples in 1 of the three Voices, each Osc has amazing quality! The rich reverb and delays can be tweaked millions of ways! A MUST for any synth owner!!

Green Oak, please make a dashboard menu for easy access to upload and download presets are o Dropbox, a clean GUI... Something simple...
thank you Dev team for making a dream app!!!

Crystal Synth XT
View In iTunes
This app is designed for both iPhone and iPad
  • $4.99
  • Category: Music
  • Updated:
  • Version: 2.1
  • Size: 26.8 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 5.1 or later. Compatible with iPhone, iPad, and iPod touch. This app is optimized for iPhone 5.

Customer Ratings

Current Version:
All Versions:

More by Green Oak Software