What’s New

Version 2.0

Many, many changes!
- Inter-App Audio and Audiobus Compatibility
- MIDI Send (as IAP)
- Landscape for iPad
- Completely redesigned Note List now integrated into main display
- Velocity based transformations
- Global reverb control
- User sample management
- Improved system for project saving
- Tempo calculations based on user selected meter
- Many bug fixes

Ratings and Reviews

4.7 out of 5
18 Ratings

18 Ratings

qqoripyo ,

What a wonderful work! Also suggestion!

Option for auto-starting newly loaded project would be helpful

michaeljjay ,

Paying for midi outputs?

Well Jeff, that post was 6 months ago? I wish I could show everyone the screenshot that I have with me. It says “Enable MIDI?
Sending midi to other application/Devices is available as an in-app purchase ($4.99). If you would like to enable sending midi, select ‘Purchase Send MIDI’’. If you have reinstalled Concentric Rhythm and need to restore the purchase, select Restore Send MIDI’.
It showed 6 months ago on 1 option. 1: Purchase Send Midi.
After checking back 6 months later, it now shows 2 options.
1: Purchase send Midi.
2: Restore Send Midi.

There was no restore send midi option when that post was made but if you were concerned about what people were saying, maybe you should pay close attention to your customers and ratings.
I’ve updated my rating to 4.

I had a conversation with this guy about making this app with 16 midi outputs a few months ago, even sent him some concepts. That’s when I paid for this app and midi outputs was part of the purchase. Now it still doesn’t even have 16 midi outputs and he’s charging people to use 1 midi output?


Developer Response ,

This is somewhat misleading. The MIDI IAP lets you send each ring to a different MIDI channel. You can use up to 9 rings, so you can send to 9 different channels simultaneously (but you can assign each ring to any 9 of the 16 channels). I don't understand what you mean when you say I am 'charging people to use 1 midi output'? There are as many outputs as there are rings - and there are 9 rings. Most people don't even use all 9.

Anyway, I do appreciate that you took the time to email me an alternative layout idea for the UI - but after consideration, I decided not to implement it. I found that adding more rings to the screen made the app more difficult to use. I love it that people send me their ideas for the app - but not all ideas are workable.

Henry Junior ,


Excited by the app, so promising and lots to like. Then, I bought the midi out In-app purchase for $5 only to discover that the Audiobus integration doesn't support midi in Audiobus 3. That's kind of baffling. Hope it's gonna be added soon. I paid for midi out because I wanted to route midi from this app via Audiobus 3 to other Audiobus midi apps.

Update: thanks to the developer for explaining. It might be worth communicating that in the app description (something akin to does not yet support Audiobus 3 but will.)

Developer Response ,

Hi, the Audiobus 3 SDK has not been publicly released yet! It has been presumably shared with the makers of many high profile apps, but it hasn't been made it available to the majority of developers yet. I'll definitely include it in a future update.


Jeff Holtzkener
37.2 MB

Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© Jeff Holtzkener
In-App Purchases
  1. MIDI Send $4.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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