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Polyrhythmic instrument/MIDI sequencer
This is a project I've been working on: an iOS app that uses a visual metaphor of gears, where gear ratios determine polyrhythms, and the angle of connection determines pitch. Here are a couple demos:
Gears can be be connected, disconnected, dragged, resized, etc. Small changes can result in cascading harmonic effects. My hope is that it's intuitive to use but can produce complex and interesting compositions.
It can be a standalone instrument (producing its own sound), or act as a MIDI sequencer.
This was originally a personal creative project, but it's evolved into something that I'd like to try to release into the world. Any thoughts would be appreciated! And if anyone is interested in trying out a beta, I share those on my substack: https://phasechimes.substack.com
Comments
Looks really interesting...
@murphlab
Looks cool indeed, but most people here really want their apps to be AUv3, so they can be loaded as plugins inside host apps, can save state there, multiple instances can be used etc. It being standalone only will greatly limit potential sales. Any plans to add AUv3 support?
Yes, I'm planning to implement that. I've been getting that feedback a lot! I'm still educating myself on what that entails but I don't see any obstacles so far.
Thanks!
Looks lovely and sounds good.
Some speculative ideas for a future extension: Are you familiar with the Borderlands Granular app? I was just thinking that the collection of gears in your Piano demo could be viewed as a "gear cloud" that you could move around and connect with various sources placed on the 2D plane, similar to how grain clouds interact with samples in BG (but in your case it could be interacting with midi target boxes). Then you could have multiple such gear clouds, each with its own set of parameters.
@murphlab Seems interesting for sure, but maybe with some things missing in terms of functionality / UX. Here are my 2 cents so far:
Doesn’t seem to run in background mode, ideally there would be a toggle for that.
Midi output seems to keep resetting to Network Session - better if it would remember its last setting.
Adjusting velocity from 100 to, say, 50, is very tedious, as it requires 50 taps - there should ideally be an option for swiping for faster adjustments.
I think the velocity scaling slider would be more useful on the main UI as a performance control tbh, than tucked away in Settings.
Ability to double tap to add or remove a Gear would be good, I reckon.
Ability to make custom scales would be good - just needs a little keyboard for example, in Settings, where the user can select which notes would be included. Could even just be a list of note names and the user toggles which ones are included in the scale.
Is dragging it away from other gears the only way to temporarily mute a Gear, or am I missing something?
This looks great @murphlab . I’m a sucker for new/interesting approaches to sequencing…..Good suggestions above from regular forum members. Will see if I can hop on the beta. Good luck!
Glad you found your way here! I’m a sucker for the touchscreen focused apps of the old days, do this is right up my alley. Can’t wait to watch it grow 🤙
I’m in! Just downloaded the beta, and will try it out. @murphlab
I’m also a sucker for creative midi sequencers, and also love apps that embrace “touch”; in a time where many new apps seem to have that as an afterthought. We see this more from apps that are ports from desktop applications, and having K/B & mouse support is great and all, but this is iPadOS (or iOS) and we want to use this fancy 10 point multitouch screen. 😁
First thought right off the bat; I don’t see any “Gears”, only circles. Need some Gear graphics, make it look like actual gears, (I’m picturing the gears inside a fine Swiss timepiece or watch) and don’t just use gear graphics, but make those teeth on the gears mean something, like the amount of teeth equals a subdivision or measure of another gear. I’m sure you’re already way ahead of me on this thinking!
Of course I understand this is an early build, and it’s early in development. You’ve got to get the bones of the app, the meat and potatoes, all working first, but keep in mind the UI, how it looks, and how it responds to touch, will play a big part in how it’s received.
AUV3 - absolutely a must if you want to see any sales. The majority of users here won’t buy it if it’s not an auv3.
There are some of us that do understand auv3 isn’t really that important with a midi app, especially with iPadOS 26 and the new “floating windows” thing, routing MIDI from one app to another is super simple, but I digress, most will want that auv3 before they click on that BUY button.
Another big thing if you want to stay ahead of the curve, is to develop with iPadOS 27 in mind, and the way Apple is changing things up for the future. Please take a look at the “KQ Apps” thread for more info.
Interesting app and nice interface..
AUV3 as most people will suggest. Not sure spending time on internal sounds is worth it if you go AUV3.
Personally I always like things like octave, scale etc dropped down to the lowest level I.e. down to the gear level. This opens up so many opportunities.
Similarly midi channel needs to be per gear.
Gear colouring and naming would be nice.
Agree with all the above comments as well.
Keep up the good work !
I'd agree if it wasn't for one thing...multiple instances...
I really appreciate all this feedback so far! Thanks for downloading and giving it some real thought! E.g. @Edward_Alexander @Gavinski @bleep @GeoTony
Yes it's still very raw. The core functionality is there, so I'm trying to get that in the hands of people, but it has a way to go to be truly useful.
Some other things not mentioned that are coming in the next release:
And a lot more coming down the road.
Thanks again for all this!
True. Right you are!
Great! Don't underestimate a) how important AUv3 is b) how much work will likely be involved for you to make this AUv3!
What a novel approach! I hope you go great places with it.
And I just downloaded the beta, will report back
Thanks! And thanks for trying it out.
Depends on how OP would implement it. ISymphonic has 16 “pages” in the native app that can run 16 different midi channels from the IAA instance. Saves quite a bit on CPU and actually offers full functionality compared to the auv3
My first thought was gears for the visual part, that would make it more like lego technic, but also more intuitive looking how each of the rhythms would be going.
Of course some gears wouldn’t fit, if they hadn’t a common denominator of spikes (I guess), but that could be a feature, because that’s how polyrhythms work, only gears that fit even though it might take a small gear several ticks to turn a bigger one
Even a smaller inner mark on the circles, besides the big one, and some visual clue when they click together
It looks dangerously hypnotic. And Steve Reich-y. I'll grab it for sure when it's ready !
Must be fun to trigger percussion sounds too.
Check out Poly / Poly2 for a somewhat similar take, without the mutual interdependency from track to track.
Steve Reich was very much the inspiration for the original project that just grew out of! Yes Ive played around with percussion a little bit