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Crystal Synth XT

By Green Oak Software

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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 2.0.6

Added an option for a piano-style keyboard when using an iPad. Restored support for ios6.

Positive reviews are always appreciated and encourage us to provide updates! 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

Massive Powerhouse

This synth has some amazing features and capacities that will blow your mind. I love everything about the iOS version of Crystal (especially on my iPad) excepting its monophony. The free VST/AU plug-in I use in Ableton on my Mac is polyphonic, so it must have something to do with device capabilities. With the new iPad Air 2 and its 2-Gigs of ram, we may just see polyphony on iOS sooner than later.

While Crystal on the iPhone behaves mostly like a preset player with some morphing capacities, iPad users get the full sound design capabilities of the Desktop counterpart, which ROCKS! because now I can craft sounds with Crystal right from the comfortable convenience of my my iPad.

I decided to download and give the VST a go on my Mac before buying XT several hours later I emerged from the outer rings of Alpha-Seti-IV and purchased CrystalXT for my iPhone. My only regret is not buying an iPad sooner. ;-)

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

If you are a serious musician, looking for an AMAZING instrument, Green Oak's "Crystal" will fulfill your every want and desire!
This synth is so much more than anything on the market, no other synth can even compete. It is the best few dollars i have ever spent!
If you want RICH, LUSH strings that weep, and cry there are Cellos, Violas, Violins, Basses, if you want that acid feel, with subtractive and additive saws, that blow the screen off your speakers there are an assortment of amazing SF's!
But to me it's the filter controls that separate the boys from men. Each of the three Osc's have The pitch control, the unlimited ways that you can add gates. The effects like Delay and Reverb have endless possibilities!!

Just fantastic for sound design

Ya know, I really didn't dig too deeply into Crystal on the Mac, though I've had it for many years. This is totally my loss! After diving into it on the ipad, it has become one of my favorites alongside Nave and several others. Crystal's modulation routing matrix among other features just make it such an incredible tool for making fantastic sounds that can evolve or cut or whatever you need. It's crazy good. Highly recommended! I am a professional composer/ engineer/musician/sound designer and I'm crazy grateful that this was ported to the ipad. So good!

Crystal Synth XT
View In iTunes
This app is designed for both iPhone and iPad
  • $4.99
  • Category: Music
  • Updated:
  • Version: 2.0.6
  • 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.

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