Off topic

Seeking Phase Lag & Oscillator Feedback for a Physical, Non-Electronic Fluidic Circuit (CC BY-NC 4.0)

Jake 15m3 — Mon, 25 May 2026 09:01:22 GMT

Hi David,
Thank you so much for that link! The discussion on real poles and the low-pass source code is exactly the bridge we need. You hit the nail on the head—the fluid dynamics of this incompressible liquid mirror audio dataflow perfectly.
Your link helps us model the 'charging' phase beautifully, where the biochar matrix acts like the time-domain ramp of a [lop~] filter.
Reflecting on your advice, I've been thinking about how to model the 'reset/restart' phase, which is highly asymmetrical. When the check valve snaps open, the sudden backpressure and directional flow shift feel less like a simple low-pass and more like a band-pass filter experiencing heavy asymmetrical clipping. The water hammer acts like a massive initial resonant peak that forcefully clears the system before the loop clips and resets.
I realize now we can model this entire cycle in Pd using [delwrite~] and [delread~] for the matrix time-delay, fed through the sigpack diode object to handle the non-linear threshold switching. This should let us fully simulate fluidic astable switching!
We would love to synthesize these behaviors to test a complete mathematical model of the physics. We’ve also just opened a second issue on our GitHub to design a way to cross-couple two of these modules (180^{\circ }) out-of-phase (like a two-phase AC generator) to eliminate the reset dead-time entirely.
If you or anyone else wants to explore the logic layout, our primary hub is here: https://github.com/MeshTent/Passive-fluidic-micro-hydro/issues/2.
Massive thanks for pointing us in the right direction!

Books about music

Il pleut — Wed, 20 May 2026 04:59:44 GMT

I post one more photo of a book by Tom Johnson, who passed away during the last days of 2024.

Pure Data and AI

atux — Sun, 08 Mar 2026 00:01:49 GMT

@porres said:

@dreamer said:

I don't think you understand what AI is or does

+1

-1

Can you give me more information about Pure Data CEAMMC?

whale-av — Fri, 30 Jan 2026 12:54:16 GMT

@porres Ah..... I woke up this morning wondering if that would be the case. What is the chance that installing it and then setting a path to the library for Plugdata would work? Or do you think that it makes changes to the Pd binary?
You obviously have much more experience of such things.
David.

What differentiates the versions?

oid — Fri, 30 May 2025 23:48:57 GMT

There is also pd-next which is mostly vanilla pd but with color themes and [closebang]/[initbang]. Nice for those that prefer vanilla but don't want to stare at a white screen.
https://forum.pdpatchrepo.info/topic/10943/a-little-pd-mod

Greeting wording.

davpez153 — Thu, 16 Jan 2025 19:20:42 GMT

Hello, PD folks! Glad to be here!

Music, with video or not.

Il pleut — Fri, 13 Dec 2024 18:47:43 GMT

Videos about music

Il pleut — Fri, 28 Jul 2023 18:52:40 GMT

Let's start with a serie of videos of Tom Johnson speaking of his compositions.

That low bitrate mp3 sound

spoidy23 — Fri, 13 Dec 2024 10:23:13 GMT

That’s an interesting point.
The bubbling sound might happen because both FFT and MDCT work with overlapping windows and process data in a similar way. This could be why it sounds like low-bitrate MP3s

Reversing/Inverting Sawtooth alters the sound?

Booberg — Mon, 30 Aug 2021 12:46:32 GMT

@oid I had a bunch to deal last week with so i'm just getting back to this. Prodding around with slew in the feedback of my ladder code ended up being quite weird and perhaps a bit to sensitive to dynamics. I don't fully understand why but it sets off a very strong and weird sounding self-oscillation at higher resonance if not carefully tuned. Sound good at some volumes but absolute rubbish at others.. I don't think it is that missing link i've been looking for.
Regarding the formulation of ladder filters i find that stacking 4 one pole filters gets closer to the real deal than for example using 2 biquads. Especially of we ad some "random tolerances" by offsetting the cutoff frequency of a couple of poles as well as introduce some slightly asymmetrical clipping between stages. But it is hard balancing these things I think the most important aspect is probably finding a balance between the clipping points of the feedback and the "filter". I'm actually surprised by how close one can come to authenticity with just a little clipping in the right places. It's just that illusive last 5-10% or so that is just bugging me endlessly

LTSpice is definitively available for OSX, it just looks a bit different. My guess is that chematics are allso cross-platform, but i'm not well versed in the software. Best of luck with your endevours!

For those of you doing work with Microbits: an online editor (not mine)

sv — Sat, 21 Sep 2024 02:14:05 GMT

https://create.withcode.uk/python/4s

I am in no way affiliated with the developer.

It is way, way more function-specific than the python editor (can't speak to the MS one as I don't use it),

Peace through Sharing=Love through Music.

-s

Programming CLI interfaces for pd patches: which programming language do I need to learn?

seb-harmonik.ar — Fri, 12 Jul 2024 07:18:06 GMT

to add onto that it's convenient to have a simple abstraction that allows for dispatching to sends based on the 1st element in a list (and that gets cast from 'anything')
so you can send "blah list thing1 thing2;" from the pdsend program (or some program sending to it) or directly over network
and receive "list thing1 thing2" at a [r blah] object in pd
and that can also be wrapped into 1 object of course:

As far as which languages to use, personally I tried using Lua coroutines and even made a library to run scores with pdlua https://github.com/sebshader/lscore, but right now I think I'm going to use nelua for the next version (other candidates have been crystal, Felix, and kotlin).
But those might not play the best w/ the terminal and nurses, for that I'd probably go with something like Lua or lua-jit maybe

Violent Violins Exposed

[[global:guest]] — Mon, 01 Jul 2024 19:55:43 GMT

Hello all,

I hope you’re doing well! I wanted to share my album released on the 3rd of April called Violent Violins Exposed!

It is experimental electronic that incorporates elements of ambient, breakcore, metal and video game music. A lot of PD was used for the creation, composition and processing of various layers of the tracks so I thought to share it here! You can listen to it here:

https://babakahteshamipour.bandcamp.com/album/violent-violins-exposed

It was also album of the day on bandcamp on the 8th of April! You can read the review here:

https://daily.bandcamp.com/album-of-the-day/babak-ahteshamipour-violent-violins-exposed-review

Hope you enjoy it! Let me know what you think about it! You can reach me out through my website or instagram which you can find on bandcamp!

Some wallpapers I made of the plugdata interface.

Carambolooo — Thu, 16 May 2024 16:29:54 GMT

So, I took several screenshots of some patches I have in plugdata, and I modified and superimposed them to have a background on my laptop.

I don't know how much relevance this has for the forum, but I really like to take advantage of programs like plugdata beyond its general purpose! in this case, for the design of a background :'')

why saw and square 'sound' louder?

Obineg — Fri, 10 May 2024 04:35:52 GMT

there is no need to measure the RMS of a known waveform, since you can calculate it offline much more precise. the energy of a wave/halfwave/periodic vibration is the size of the geometric surface: 1 for square, 0.5 for tri and saw, 0.707 for sinus...

Starting a Pure Data Wiki (Database/Examples Collection)

seb-harmonik.ar — Sat, 02 Dec 2023 04:00:02 GMT

I think I'm going to take it down soon, but for a work/training project I made a prototype database thing for pd that documents external objects w/brief descriptions about what they do, tags, and long description/documentation. Users could edit descriptions, docs, and tags of objects and libraries as well as search object or libraries by name, tag, or author.
http://puredatabase2-app-bucket.s3-website-us-west-1.amazonaws.com

I guess it's not really a wiki but.. I thought such a database/wiki thing might also be useful

I'm not sure how to do the math in this patch.

oid — Wed, 01 May 2024 09:24:00 GMT

@whale-av If it were me I would just use a list box and type it all in but I assumed OP has a reason for doing it this way, possibly not a good reason but we all chase our tails at times. I would go with [list append/prepend] over {add2( for your way, having to {set( the message to clear it every go around seems an unnecessary step which is why I made everything a list in mine instead of making everything an any. One downside to the calculator interface is you either have preset numbers to select from or need an enter button, will be at least two clicks and could be half a dozen which is not great if you are trying to keep in time with a beat. List box has this same issue, OP might be on the right track.

I like these vague threads, get lots of ideas instead of a quick answer ending the thread.

ChatGPT to generate pd patch

Obineg — Sat, 18 Nov 2023 02:19:08 GMT

@ddw_music said:

I don't have the link handy, but one commentator called GPT a "mansplaining machine" -- often wrong, but projecting absolute confidence in its answers.

then it is evident: chatGPT is a politician.

HELP!!! noteout - how do we record external sounds to pd?

gazzyjuruj — Wed, 23 Aug 2023 18:47:53 GMT

or you can route that midi note out to a DAW or any software you like that you want to control with pure data.

Musical online publications

Il pleut — Sun, 20 Aug 2023 20:31:51 GMT

Now ,the website of Allen Forte
Who wrote, among other projects, essential books about music theory.

How to sequence events in C/C++

Spacechild1 — Mon, 24 Jul 2023 21:59:43 GMT

@seb-harmonik.ar said:

@Obineg all of pd vanilla runs on 1 thread (well, the 'core' non-wish process anyways)
Message processing is simply interspersed w/ audio processing.

Almost. Pd does use a single thread for DSP and message processing, but this is not the same as the audio callback (unless "use callbacks" is enabled), so you have (at least) two threads.

Side note: In Pd, the audio callback does almost no work; it just reads/writes samples from/to a ringbuffer and returns. Pd's main thread waits on the ringbuffer (see sys_send_dacs), so it is indirectly (asynchronously) driven by the audio callback.

warble tones considered harmful?

ddw_music — Mon, 15 May 2023 13:48:13 GMT

@oid said:

@ddw_music said:

One of the sines is too low to be audible

How does the amplifier and speaker know what is audible? We can hear the tremolo effect of this beating so the speaker has to be moving at that rate and those tones we hear as tones are moving on top of that beating...

Perhaps, but when I checked standard sine vs sine amplitude modulation (ring modulation), any subaudio energy was too low to be detected, nowhere near loud enough to burn anything. There might have been some subaudio energy but it must have been at least 70-80 dB below the upper frequencies.

EDIT: SuperCollider's freqScope shows a peak up to 0 dB around 440 Hz, and low-frequency energy hovering around -80 or -90 dB for SinOsc.ar(440) * SinOsc.ar(4):

That's some subaudio but still much quieter than the sine waves.

hjh

Pd users in greece?

jojo23 — Sun, 16 Apr 2023 16:14:43 GMT

Creating a community-website for PureData and sound synthesis in Greek language sounds like a great idea! It can be an excellent resource for people who are interested in this field and can help build a community of like-minded individuals who can share their knowledge and ideas.

To get started, you may want to begin by researching popular platforms for building a community-website such as WordPress, Wix, or Squarespace. Once you have chosen a platform, you can then start creating content for your website.

Consider creating tutorials, articles, and videos on PureData and other sound synthesis software in Greek language. You can also share news and updates related to sound synthesis and create forums where people can ask questions and share their experiences.

To attract people to your website, you can promote it on social media platforms and forums related to sound synthesis. You can also reach out to universities and music schools in Greece to see if they would be interested in collaborating with you to promote your website.

Remember to be patient, building a community takes time, but with dedication and persistence, you can create a valuable resource for people interested in sound synthesis in Greece.

Abstraction folder names on macOS

ben.wes — Tue, 11 Apr 2023 17:28:19 GMT

@whale-av thanks a lot for the quick response! I guess I'll give up on these names then (although aesthetically I prefer the separating periods to underscores or hyphens - but that's obviously not an argument anymore). so it's going to be "perlin_3d~" etc. in the future... acceptable enough.

Transform and enhance an audio file

Obineg — Tue, 04 Apr 2023 00:27:14 GMT

ahoi jayrope, du auch hier?

changing the timbre of an existing recording with an already pitched instrument is difficult, but slightly changes are possible to an extent.

for a sinewave or theremin i would start with a waveshaper and eventually split the signal into upwards and downwards and treat the parts differently.

your opinions RE: other visual programming environments vs PD

ddw_music — Sun, 02 Apr 2023 01:03:52 GMT

@60hz said:

Otherwise for audio only... there is PlugData!

It's great! But I need GEM for class...

hjh