About FM4
FM4 is a four operator FM synthesizer for iPad. - Reached rank #1 in the app store top paid music category in 32 countries, including United States, Canada, UK, Germany, France, Brazil, Italy, Russia, Australia, and...
FM4 is a four operator FM synthesizer for iPad. - Reached rank #1 in the app store top paid music category in 32 countries, including United States, Canada, UK, Germany, France, Brazil, Italy, Russia, Australia, and India. Features: - Four operators configurable in eight different routings - Three sound engines modelled on 1980s hardware units - Eight waveforms derived from classic FM synths - 2x, 3x, and 4x polyphonic unison - Tempo-syncable arpeggiator with up, down, up-down, and random patterns - Microtuning with eight different temperaments - Inter-App Audio - Supports Audiobus 2 - MIDI over bluetooth - Up to 24 voices of polyphony - Presets can be imported/exported through iTunes Modelled on the popular DX series from the 1980s FM4 provides the same gritty sound, with a modern interface, and without being bound by the limitations of the original units. Every aspect of the hardware - from envelope curves to sine-table sizes and quantisation errors to digital-to-analogue converters - has been meticulously analysed, in order to recreate the raw and dirty sound of the original units. The interface has been carefully thought-out and is simple and intuitive, yet powerful - with every parameter being available on a single page. No menus, tabs, or jumping from page to page. FM4 is capable of producing a multitude of sounds, ranging from punchy basses, crystal-clear bells, and lush pads, to organic textures, striking drums, and piercing leads. All product names used are trademarks of their respective owners, and reference to these here in no way constitutes an association or affiliation with Primal Audio. All trademarks are solely used to identify the products whose sound was studied during the development of FM4.
Version History This update from Apple will improve the functionality of this app. No new features are included. - Fixed bug in iOS 9 where the operator buttons would disappear. - Minor bug corrections. Disclaimer: The are some problems with the locations of popovers in iOS 9.0. We are waiting for Apple to look into this. 1.2.2 10/01/2015 HOT FIX: Fixed crackling noise on old iPads. 1.2.1 05/20/2015 - bug fixes - two new preset banks - updated UI 1.2 05/16/2015 - improved stability - fixed midi-sync crash - fixed iOS 7 waveform popover bug 1.1.1 03/11/2015 - A free lite version - Audiobus support - iOS 7.0.x crash has been fixed - Performance boost: the UI responsiveness has been drastically improved - App-size has been reduced with more than 60% - The manual is up - Added a tempo popover with manual control of the tempo - Added a waveform popover with an overview of waveforms - Minor bug fixes 1.1 01/27/2015 Fixed some minor bugs. 1.0.1 12/31/2014 MIDI is now fully functional. Reorganised factory presets into categories. Fixed minor bugs. Added popovers for accessing our website (click on the logos in the app). Added Steinholtz-Wegmann tuning. 1.0 12/17/2014 0.4 12/09/2014
Previous Versions
Here you can find the changelog of FM4 since it was posted on our website on 2016-12-26 19:54:04.
The latest version is 1.2.2 and it was updated on 2026-06-09 16:58:05. See below the changes in each version.
FM4 version 1.2.2
Updated At: 2026-06-09
Changes: Version History This update from Apple will improve the functionality of this app. No new features are included.
- Fixed bug in iOS 9 where the operator buttons would disappear.
- Minor bug corrections.
Disclaimer: The are some problems with the locations of popovers in iOS 9.0. We are waiting for Apple to look into this. 1.2.2 10/01/2015 HOT FIX: Fixed crackling noise on old iPads. 1.2.1 05/20/2015 - bug fixes
- two new preset banks
- updated UI 1.2 05/16/2015 - improved stability
- fixed midi-sync crash
- fixed iOS 7 waveform popover bug 1.1.1 03/11/2015 - A free lite version
- Audiobus support
- iOS 7.0.x crash has been fixed
- Performance boost: the UI responsiveness has been drastically improved
- App-size has been reduced with more than 60%
- The manual is up
- Added a tempo popover with manual control of the tempo
- Added a waveform popover with an overview of waveforms
- Minor bug fixes 1.1 01/27/2015 Fixed some minor bugs. 1.0.1 12/31/2014 MIDI is now fully functional.
Reorganised factory presets into categories.
Fixed minor bugs.
Added popovers for accessing our website (click on the logos in the app).
Added Steinholtz-Wegmann tuning. 1.0 12/17/2014 0.4 12/09/2014
FM4 version 1.2.2
Updated At: 2015-10-01
Changes: Oct 1, 2015
Version 1.2.2
This app has been updated by Apple to display the Apple Watch app icon.
- Fixed bug in iOS 9 where the operator buttons would disappear.
- Minor bug corrections.
Disclaimer: The are some problems with the locations of popovers in iOS 9.0. We are waiting for Apple to look into this.
FM4 version 1.2.2
Updated At: 2014-12-11
Disclaimer
Official App Store Link
We do not host FM4 on our servers. We did not scan it for viruses, adware, spyware or other type of malware. This app is hosted by Apple and passed their terms and conditions to be listed there. We recommend caution when installing it.
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