KQ Dixie

KQ Dixie is a 6-Operator FM synthesizer that is modeled on the synthesizer which appeared on the 1980s.

Frequently Asked Questions
Contact Information is here.
Reference manual is here.
Could you support me?

KQ Dixie Icon
KQ Dixie
Ryouta Kira
Download on the App Store


FM synthesizers make sounds with Frequency Modulation.
FM brings rich and brilliant sounds which are impossible to create with analog one.
It makes very complex waves with simple modulations.
The same method is used for a radio.
The synthesizer gained much popularity in the 1980s.

This app lets you make sounds freely with 156 voice parameters.
Almost all parameters but multi-timbres, unisons, filters, and delay are compatible with Yamaha DX7 mark I.

Audio Unit v3 compatible.
Audiobus compatible.
32 algorithms included.
You can manage the hardware DX7 when it is connected with external MIDI cables.
Supports DX7 System Exclusive Messages (SysEx) and syx files.
Supports Zip files.
You may be able to find a lot of patches on the internet.
A Multi-timbre, Unison function is included.
May be available to connect Korg Volca FM via an audio cable / MIDI.

URL Scheme: kqdixie://

About Audiobus

Introducing Audiobus support: Now you can stream live audio directly to other Audiobus-compatible apps! See http://audiob.us for more information.

KQ Dixie Icon
KQ Dixie
Ryouta Kira
Download on the App Store

Bug Information

Version between 3.3.11 and 3.4.2

Users cannot load dxpf files correctly.
This bug was fixed on the version 3.4.3.

Version between 3.3 and 3.3.10

The EG engine V4 included by the app versions is not the latest version.
Please update to the version 3.3.11.

Version 3.1.7

Some parameters (Portamento and Pan) did not have any changes.
This bug was fixed on version 3.1.8.

Version 2.4.9 or below

The portamento went wrong if middle C is not C3 and is in poly mode.
Also, “suskey P retain” and “suskey P follow” may be reversed on the param screen.
This bug was fixed on version 3.0.

Version 2.4.7

The app crashes when you have no extra files.
This bug was fixed on version 2.4.8 or above.

Version between 2.3 and 2.3.2

Detune did not work if Engine Version is 1 or above.
This bug was fixed on version 2.3.3 or above.

Version between 2.2 and 2.2.2

Multiple feedback operators did not sound. (Algorithm 4 and 6)
This bug was fixed on version 2.2.3 or above.

Version 2.0 and 2.0.1

Function Parameters were not saved.
The parameters will be saved in a dxpf file on version 2.0.2 or above.

Version 1.0.5 or below

LFO on amplitude modulation was inverted.
(Saw up should have increased the amplitude but actually decreased.)
This bug was fixed on version 1.0.6 or above.

Version 1.0.1 or below

The app might crash if iCloud is off.
This bug was fixed on version 1.0.2 or above.

Version 1.0

The app crashed when file name contains spaces and/or other special characters.
This bug was fixed on version 1.0.1 or above.

KQ Dixie Icon
KQ Dixie
Ryouta Kira
Download on the App Store

Update history

Date Format: Year-Month-Day (JST, UTC+9).

Version 3.4.5 (2024-06-05)

Fixed some AU parameter issues.

Version 3.4.4 (2024-06-05)

The transpose buttons are now shared across all timbres. To change the settings for each timbre individually, disable “Common Transpose Buttons” in the preferences screen or go to the multi-timbre settings.

Fixed issues that prevented some controllers’ offset from being applied.

Version 3.4.2, 3.4.3 (2024-05-29)

Fixed issues that prevented dxpf files from loading correctly.

Version 3.4.1 (2024-05-24)

Fixed some appearances.

Version 3.4 (2024-05-24)

Added new engines. The new EG engine V5 is closer to the DX7.

Version 3.3.11 (2024-05-22)

Fixed an issue that prevented from using smoothing.
Fixed an issue where EG engine settings were not applied.
Fixed an issue that occurred with a specific combination of a controller process version and a EG engine version.
Other fixes.

Version 3.3.10 (2024-05-18)

Fixed a freeze bug on launch.
Fixed screen glitches.

Version 3.3.9 (2024-05-11)

Some appearances and some words have been changed.

Version 3.3.8 (2024-05-08)

Rate Scaling in EG engine V4 has been reverted to the previous version.

Version 3.3.7 (2024-05-08)

Fixed the level calculation in EG engine V4.
Other fixes.

Version 3.3.6 (2024-05-07)

Fixed the level calculation in EG engine V4.
Fixed an issue in the mono mode.

Version 3.3.5 (2024-05-07)

Fixed the level calculation in EG engine V4.

Version 3.3.4 (2024-05-06)

Fixed Level Scaling in the EG engine V4.

Version 3.3.3 (2024-05-05)

Fixed the engines.

Version 3.3.2 (2024-05-05)

Fixed the engines.

Version 3.3.1 (2024-05-05)

Small fixes.

Version 3.3 (2024-05-05)

New feature: Added engines.
The new FM/EG engines have been added.

  • 13bit FM engine
  • EG engine V4 (12bit/HR)

Improved: MIDI manager.
Virtual MIDI Destination has been added.

New feature: Stop timer
Auto shutdown timer has been added.

New feature: Key Range / Transpose
You can set the key range and transpose per part.

Fixed a bug that caused Audio Unit to display the wrong engine.

Fixed appearance in Audio Unit.

Other fixes

Version 3.2.3 (2024-04-24)

Improved: Fixed appearance when using the zoom function.

Version 3.2.2 (2024-04-24)

Improved: Added more Zoom Scales
You can choose one from more zoom scales. e.g. 95%, 115%, etc.
Fixed appearance glitches.

Version 3.2.1 (2024-04-23)

New feature: Zoom Scale
– You can zoom in/out the objects.
Other fixes.

Version 3.2 (2024-03-05)

New feature: controller offset
– You can set offset per timbre for some parameters.
New feature: multi parameter assign
– You can assign a MIDI CC to multiple parameters.
Improvement: separated Omni-channel settings
– Omni-channel settings have been separated into notes and other.

Version 3.1.11 (2023-08-21)

Bug-fix: Fixed a crash that occured when adding/removing folders.
Bug-fix: Fixed some UI controls.

Version 3.1.10 (2023-06-06)

Bug-fix: A feature that “Just Open” syx files was not working.
Other fixes.

Version 3.1.9 (2023-04-23)

Changed appearance in some sizes.

Version 3.1.8 (2023-03-16)

Bug-fix: It was fixed that some parameters (Portamento and Pan) did not have any changes.

Version 3.1.7 (2023-03-08)

Improved “breath to velocity” type c.
Added “smooth control”.

Version 3.1.6 (2023-03-07)

New: Added “breath to velocity” type c for wind instruments.
Bug-fix: “breath to velocity” settings were not loaded.

Version 3.1.5 (2023-01-21)

Improved Audio Unit View on GarageBand on iPhone.
Added Aftertouch Knob and you can assign Aftertouch.
Other fixes.

Version 3.1.4 (2023-01-06)

Added Tip Jar (for iOS/iPadOS 15 or later).
The minimum supported OS version is 12.4.

Version 3.1.3 (2022-12-24)

Behavior during MIDI transmission has been changed. In particular, behavior in converter mode has been improved.
The pitch of high note has been corrected.
Other fixes.

Version 3.1.2 (2022-12-12)

Refined controller behavior.
Especially, EG bias with lower range is improved.
Changed some labels.

Version 3.1.1 (2022-12-01)

Filter became slower. It became more smooth when changing the parameters.
Other fixes.

Version 3.1 (2022-11-28)

Added velocity curve function.
Added breath controller to velocity function.
Changed appearance.
You can turn off auto detection when assigning MIDI CC.

Version 3.0.5 (2022-10-07)

Fixed a rare crash.

Version 3.0.4 (2022-09-12)

It was fixed that The MIDI messages were invalid if you sent a normal MIDI message after sending SysEx in iOS/iPadOS 14 or later.
Improved Volca FM linkage.
It was fixed that you were not able to load the patch in bank A-C when you connected a MIDI destination.

Version 3.0.3 (2022-09-11)

Added MIDI Conversion. You can control the output device from the input device.
Now you can change MIDI Send Channel.
Added Note on/off settings in MIDI Filter.
Fixed device ID of SysEx to 0 in Volca FM mode.

Version 3.0.2 (2022-09-06)

MIDI Sources’ settings were lost when “Connect All MIDI Sources” was being off.
Fixed some Japanese translations.
Small fixes.

Version 3.0.1 (2022-09-05)

Fixed some Japanese translations.
Small fixes.

Version 3.0 (2022-09-04)

1 staging bank and 3 static banks.
Supported Volca FM. You can transmit the patch via MIDI or an Audio Cable.
64 factory patches.
Added locking features when loading a file.
Fixed portamento bugs.
Now you can turn off low-pass filter and delay effector.
Other fixes.

Version 2.4.9 (2022-04-08)

A bug in the time processing was fixed.

Version 2.4.8 (2021-12-22)

Fixed a crash bug.

Version 2.4.7 (2021-12-20)

The previous Audio Units are deprecated. This is because they fail validation in Logic Pro and MainStage. I plan to keep them for compatibility, but please attention.
This app may work on Apple Silicon Mac although I don’t have the new machine yet.

Added support for iPad portrait screen.
Fixed the appearance on iPad without a home button.
Optimized process.
Stop supporting 32bit architecture.
Required iOS 10.0 or above.
Other fixes.

Version 2.4.6 (2021-09-25)

  • Updated SDK.

Version 2.4.5 (2021-05-16)

  • Fixed rare crashes.

Version 2.4.4 (2021-02-07)

  • Fixed a crash bug.
  • Added a workaround for processing MIDI.
  • Some other fixes.

Version 2.4.3 (2020-10-20)

  • Fixed an issue that Automatic Omni mode was applied when loading a state in Audio Unit extension.
  • Some other fixes.

Version 2.4.2 (2020-09-07)

  • Updated Audiobus SDK.

Version 2.4.1 (2020-07-30)

  • Fixed a bug which occurred with large iPhone.

Version 2.4 (2020-07-23)

  • Supports Multiple-Out (“KQ Dixie Multi” Audio Unit). Use it with some supporting hosts such as AUM and apeMatrix.

Version 2.3.7 (2020-07-02)

  • Fixed a crash bug which occurs in iOS 14 (beta).

Version 2.3.6 (2020-06-23)

  • Buffer size has more option.
  • Changed Delay behavior.

Version 2.3.5 (2020-06-06)

  • Bug-fix: The app might have crashed when deleting folders.

Version 2.3.4 (2020-05-06)

  • Small fixes.

Version 2.3.3 (2020-05-01)

  • Bug-fix: Detune did not work.

Version 2.3.2 (2020-04-26)

  • Fixed a bug that tuning name was not able to be edited.

Version 2.3.1 (2020-04-25)

  • Changed the wording.
  • Fixed some bugs around micro tuning.

Version 2.3 (2020-04-23)

  • Supports Micro-Tuning. Now Dixie can play microtonal notes.
  • Added a function to connect with “FM Piano”, an app of mine.
  • Modified File Processing.
  • Modified behaviors of VU Meter.
  • Other fixes.

Version 2.2.4 (2020-03-09)

  • Added a color to patches when saving the current patch into a bank.

Version 2.2.3 (2020-02-24)

  • Bug-fix: Multiple feedback operators didn’t sound. (Algorithm 4 and 6)
  • Sounds can be updated when you tweak levels even if notes are sustained.

Version 2.2.2 (2020-02-21)

  • Fixed behaviors that the first note was not turned on when the second note was released on Mono mode.

Version 2.2.1 (2020-02-09)

  • Bug-fix: The app crashed when there were a lot of files.
    I recommend you place zip files instead of extracting them.
  • Bug-fix: The app might have crashed when opening a CC Scene file.

Version 2.2 (2020-02-05)

  • Added features:
    • Adjust Carrier’s Level. (Enable if you feel distorted sound, for example, when you use unison.)
    • Engine Version 3.
    • 12bit Engine.
  • Changed features:
    • Engine Version. (was simulate level)
    • Improved sample rate.
    • Velocity behavior at a virtual keyboard.
    • Other small fixes.

Version 2.1.1 (2020-01-13)

  • Bug-fix: A list of files except iCloud might not have been updated.

Version 2.1 (2020-01-08)

  • Added Accurate Simulation Level 2 (Previously “More Accurate Simulating” option):
    • More similar to DX7 when Envelope L1=0.
  • Changed Envelope views when L4 is not 0.
  • Bug-fix: The app might have crashed on 32-bit devices.
  • Updated Audiobus SDK.

Version 2.0.9 (2019-11-04)

  • Fixed the appearance on iOS 13.

Version 2.0.8 (2019-10-22)

  • Bug-fix: SysEx could not be opened at Files.app on iOS 13.
  • Added Import function.
  • Updated Audiobus SDK.

Version 2.0.7 (2019-09-12)

  • Fixed issue: Keys were pressed permanently when 3 finger touching.

Version 2.0.6 (2019-08-15)

  • Displays an X when a timbre is muted.
  • Resets status of mute when a Dixie Performance is loaded.

Version 2.0.5 (2019-08-14)

  • Fixed some bugs:
    • Undo didn’t work on a subfolder in a Zip file. (Undo & Redo make choosing a patch much easier.)
    • Quick-Save might not have worked.
  • Other small fixes.

Version 2.0.4 (2019-06-21)

  • Added some multi-timbre settings:
    • Mode of Patch Values
    • Mode of Program Change / Dump

Version 2.0.3 (2019-06-18)

  • Updated Audiobus SDK.

Version 2.0.2 (2019-05-31)

  • Bug-fix: Function Parameters were not saved or restored.
  • Some words have been modified.
  • Other small fixes.

Version 2.0.1 (2019-05-04)

  • Added a MIDI Filter.
  • Bug-fix: An OP may have oscillated when disabling the OP at a specific algorithm.
  • Other small fixes.

Version 2.0 (2019-04-30)

  • New Features:
    • Multi-timbre, Unison.
    • VU Meter.
    • New File Type: Dixie Performance.
    • Improved File Management.
    • Supported more SysEx.
    • Volume Boost.
    • Soft Keyboard Velocity Sensitivity.
    • Can modify the number of Soft Keyboard White Keys.
    • Undo, Redo.
  • Bug-Fixes:
    • AudioUnit Polyphony bug.
    • Other fixes.

Version 1.2.3 (2019-03-25)

  • The envelope speed was wrong when sample rate is not 44100Hz.

Version 1.2.2 (2019-01-14)

  • Bug-fix:
    • The sustain damper pedal was not reset when receiving CC#121.
    • Wrong version was displayed on Settings.app.
  • Other small fixes.

Version 1.2.1 (2019-01-06)

  • Maximum polyphony is 512.
  • Other small fixes.

Version 1.2 (2018-12-12)

  • MIDI CC Assignment. You can control all parameters via hardware MIDI knobs and sliders.
  • Added MIDI Output on Audio Unit Extension. You can record knob controls to some AU host on iOS 11 or above.
  • Supported “32 stripped 1 voice” (4960 bytes file).
  • Added links to my web site.
  • Changed Keyboard behavior.
  • Other small fixes.

Version 1.1.6 (2018-11-13)

  • Supports iOS 12.1.
  • Changed the behavior of Safe Area on Audio Unit.

Version 1.1.5 (2018-10-12)

  • Bug-fix: The layout collapsed when opening a file on iPhone which has a notch.
  • Other small fixes.

Version 1.1.4 (2018-10-04)

  • Added a “Init” patch.
  • Enabled a directory, “On My iPhone/iPad” at Files.app.

Version 1.1.3 (2018-09-22)

  • A bug-fix: The Zip-like files were always opened in KQ Dixie at Files.app.
    As a side effect, “KQ Dixie” disappears from “On My iPhone/iPad” at Files.app.
    In addition, Zip and Syx files may not open out from Files.app when you installed the past version once.
    In that case, Copy files to iCloud, Start KQ Dixie application, and Open them.

Version 1.1.2 (2018-09-14)

  • iOS 12 support.
  • The character size at the patch list on the cart has become larger on iPhone.
  • Other small fixes.

Version 1.1.1 (2018-02-21)

  • Bug-fix: SysEx files were labeled as unsupported when you added those via iTunes.

Version 1.1 (2018-02-21)

  • Added More Accurate Emulating option.
  • Fixed a glissando behavior.

Version 1.0.9 (2018-02-14)

  • The Inter-App Audio panel was not displayed when launching from the host.

Version 1.0.8 (2018-02-07)

  • Fixed Audiobus issue.
  • Supports 32-bit devices (no guarantee).

Version 1.0.7 (2018-01-30)

  • You can choose on-screen velocity slider or modulation wheel.
  • Improved memory management.
  • Other small fixes.

Version 1.0.6 (2018-01-24)

  • LFO was inverted on amplifier modulation.
  • Sometimes LFO parameters were not loaded.

Version 1.0.5 (2018-01-21)

  • Specific Zip files caused App crash.
  • Folder structure in specific Zip files was wrong.

Version 1.0.4 (2018-01-19)

  • The Audio Unit screen size is flexible if the host supports it.
  • You can hide the on-screen keyboard.
  • The app detects the character encodings of Zip files automatically.
  • Bug-fix: Displaying files had a glitch at the first launch.
  • Other small fixes.

Version 1.0.3 (2018-01-16)

  • New feature: Quick-Saving.
  • Saving 32+1 voices supported.
  • Renaming files supported.
  • Exporting files supported.
  • You can hide unsupported files in Zip files.
  • Reduce noises when volume or pan changed.
  • Some crash bugs are fixed.
  • Other small fixes.

Version 1.0.2 (2018-01-13)

  • Copying files supported.
  • Folder view in Zip archive supported.
  • Fixed some crash bugs.

Version 1.0.1 (2018-01-11)

  • Bug-fix: The app crashes when file name contains spaces.

Version 1.0 (2018-01-11)

  • The first release.

KQ Dixie Icon
KQ Dixie
Ryouta Kira
Download on the App Store

Yamaha DX7 is a trademark of Yamaha Corporation.
Volca is a trademark of Korg Inc.
I have no business relations with Yamaha and Korg.