If you are set on using just the native iOS UI tools this solution probably won't work, But I maintain a cordova plugin for libpd, you can find it here: https://github.com/robertesler/cordova-pd. There are instructions on how to use it on the README page. With cordova you can use HTML5/Javascript for your UI and interface with a Pd patch. Cordova will allow you to create an iOS platform which generates an Xcode project.
Otherwise, the examples on the pd-for-ios still 'should' work. I haven't tested all of them for at least a year, but that is also worth a shot if you really need to use native iOS UI tools.
Good luck!

Hey everyone !
I'm proud to share to you a really simple abstraction i made today named "glitch~.pd", wich I created to reproduce typical sounds of breakcore/IDM artists like Autechre, Squarepusher, Venetian Snares, etc..

The idea of this abstraction came from youtube channel "Sound Simulator", who did this excellent videos about how to make glitches with PureData

It's only a begining, do not hesitate giving your feedback / advice about it !

https://github.com/izeKake/glitch-/tree/main

Screenshot of glitch_help.pd :

Is Perfection Important?
Exploring the Sound through the Fibonacci Sequence

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This sound clip demonstrates the glitch, just after 0:03, for about one second

glitch.mp3

Hello, I feel like I've been blowing the forum up recently, sorry if I'm coming across as needy

This seems like it would be discussed a lot online but I cannot find relevant advice on it despite some intensive searching.

I'm running a Pure Data audio patch on a RPi, with an external USB soundcard. The patch samples from an external microphone and plays back the sounds in a sequence to a beat. When this 'beat sequence' playback happens, it is routed and recorded as another discrete sound file. Recording and playback are triggered by buttons connected via an Arduino Nano and the pduino object.

As I've been working towards my deadline to finish the device and ship it, the patch has become more prone to a specific audio glitch where it freezes mid sound, kind of like a skipping CD. I've experienced this before on other projects but never this frequently! I would assume I am demanding more than I should of the RPi, but I don't feel like it's a particularly processing-heavy project.

Are there ways I can avoid this glitching/skipping/freezing, either by making changes within the patch or by somehow optimizing the way my RPi is set up and running? It's only required to run this patch, so I'm wondering if purging a load of unneeded software that came with the OS might help.

Here's the patch in case that is a useful reference (I have a few abstractions I've put in there):

Any advice gratefully received - I'm worried this won't be up to a usable standard if it keeps glitching out during use!

@lacuna said:

The helpfile of soundfiler says:
"If no array name is given, no samples are read but the info is provided anyway."
Not sure if this is actually the case, as I get drop outs occasionally. Does it read the header only?

As Ross Bencina points out in a justifiably famous article, "All sources of audio glitches within your code boil down to doing something that takes longer than the buffer period. ... The main problems I’m concerned with here are with code that runs with unpredictable or un-bounded execution time. That is, you’re unable to predict in advance how long a function or algorithm will take to complete. ... Doing anything that makes your audio code wait for something else in the system would be blocking. This could be acquiring a mutex, ... snip snip..., waiting for data to be read from disk..." (hmmmm).

If [soundfiler] is blocking for filesystem access and it affects the audio thread, then it would explain the glitches. In that case, it might not even need to read a large amount of data -- if the data aren't in the filesystem RAM cache already, spinning the HD to the right speed and pushing the drive head to the right position could take longer than the available time. A SSD might fare better but there are no guarantees. Filesystem access should be treated as time-unbounded and not safe for real-time audio -- even just reading a header.

IOW if my guess is correct about [soundfiler]'s behavior, then it is breaking Bencina's prescriptions for real-time safety = bug. ("Especially if your software is going to be used to perform to a stadium full of fans... you do not want your audio to glitch. Period.")

SC's solution (shunt time-unbounded ops into a queue running in a lower priority thread) is one correct way. There might be others. I just wonder why Pd seems not to be doing that.

hjh

The glitches are gone and the mixer works now as expected
It is now also an effect chain, effect one goes into effect two and so on.
I think in the glitch version everything was mixed together...
Very nice that this is possible with Ofelia (Pure Data / Lua / Open Frameworks/ GLSL).
I use 4 fbo´s now (one for the video player and one for each effect), just did not know how to use them right.
But somehow I found some of the old glitches quite fascinating.
I would be happy about feedback and suggestions (how to improve the patch)...
One question: Right now the functionality depends on the creation order of the Ofelia objects, because that also seems to be the draw order.
Can I create a constant draw order somehow?
Edit: I think the fbo's are also the solution for a video delay, i just need to find out how to grab for example every 5th frame into 10 fbo buffers. Then I can mix the fbo's with a GLSL file...

GLSL_Video_Mixer.zip

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@nicnut I am not sure that setting the block-size high is really helping....... the advantage will be slight, but it is important that it is matched to your soundcard. The delay (buffer) will help with glitches, but increase the latency, so should be set just high enough to stop any glitches. The Delay (mSecs) is what you see referred to as buffer.... in samples..... elsewhere..... so for example at 44.1KHz Delay 100mSec is a buffer of 4410 samples rounded down to 2 blocks.....
You might have the Linux -rt (real-time for audio) switch available on the Pi which could help with glitches...... add -rt to Pd preferences "startup flags"
Good practice is to hide arrays in sub-patches, and reduce any screen drawing to an absolute minimum. All the gui stuff is being done between audio ticks, and screen drawing can take too long.
Video cards, Wi-Fi cards, interrupts (especially usb)....... everything else the computer is doing..... can cause glitches by taking too long to complete.
Check out the tuning tips found here........ https://support.native-instruments.com/hc/en-us/search?utf8=✓&query=windows7+tuning+tips for windows and osx but always relevant.
Check out chapter 2.4.2 onwards here as well........ http://puredata.info/docs/manuals/pd/x2.htm

You might need a powered hub for your usb midi. There might not be enough power for it as the Cpu load gets heavy.
David.

Fresh installed Windows 10 (needed it anyway, it's been like a year)

Now the GUI works properly. But oh boy the audio does not.

No audio without ASIO4All. When I select ASIO4All, I hearmy [osc~] but glitchy as hell. Changing the delay or the blocksize changes the perceived frequency of the glitchy sine wave. And PureData crashes, I can't close the window. The glitchy sine wave persists after having force quit Pd.

I don't use asio4all with other softwares. Here's a screenshot of the control panel of asio4all

Even if the problem is not yet solved I really appreciate your help @whale-av, thank you for your time !