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DaSheng Hen

I use js code to randomly generate 10 numbers and save them in dict. I can receive the numbers normally, but why does dict always prompt "dict: doesn't understand "int"" ?

dict-error-message

Dict error message

Carlos Araneta

I'm studying the Step by Step book by Greg Taylor and i'm stuck on one of the first examples, namely the rotating group sequence patch. Basically i wanted the live.step object to display the sequence of each slot i choose on the matrixctrl object but it doesn't, i wanted to change the sequences of the other patterns on the matrixctrl since this patch is an example of a polyphony mode but so far i can't let it display it. is there by any chance i'm missing a message, argument, or attribute in this one? Thank you

sbs book rotating groups question.PNG

Hi all,
I'm studying the Step by Step book by Greg Taylor and i'm stuck on one of the first examples, namely the rotating group sequence pat

rotating-group-sequence-question

Hello, Carlos.

I'm not entirely certain of what it is you wish to do, but let me see if we can hone in on it

The matrixctrl object that feeds the right inlet of the sequence_select abstraction just displays the current state of the individual sequences in the "stack" that are being triggered. you select the specific sequencer using the umenu item attached to the rotate_me abstraction. The ones and zeros indicate which of the 8 stacked sequences will be played - you'll notice that the pattern displayed in the matrixctrl object corresponds to the umenu pattern of zeros and ones as it rotates through the sequence of 8 patterns,

If you want to change the contents of that first stack, you use the umenu connected to the mode $1 message box, of course. I left off the display of each stack individually because it was going to be a part of a series of homework assignments for persons using the book as a classroom text. There are a number of places in each chapter where the absence of something can be explained by that simple fact. :-)

When it comes to that stuff, a quick look at the very first tab of the live.step object's help file should be of some assistance, since it shows you how to select which sequence you wish to display, and also the message you use to tell the live.step object which sequence you want to edit. I hope this helps.

(Oh... and I prefer Gregory. Thanks.)

Thanks for the response. I figured that would be the case in which the individual stacks would be an upcoming exercise on how to make it display in the live.step object. I just assumed that it can be viewed already by the way the patch is already.  I thought i can view the sequence of each stack on the live.step object by pressing the matrixctrl,  kinda like the previous patch before this on your book, the one where we can do a display switch by using the tab object. 

Rotating group sequence question

colony nofi

Take a look at the following super simple batch

Its just an adstatus 0 connected to a umenu - nothing to it.  Just adding it here in case it helps. Reports my inputs / what hardware is in use for inputs.

I've been attempting to build a patch that re-connects to particular inputs / outputs whenever possible (using a 5 sec heartbeat rather than real time) - but thats another story.  Made some interesting discoveries, and also managed to crash max a 

However, tonight when finishing up another idea, I noticed some slightly unexpected behaviour.  For giggles, (and just following my nose) I printed the output of adstatus to the console - and saw something super interesting.  To me at least.  Its likely well known to many knowledgable folk here.

Whenever I went into the Audio Status menu (options) - and changed the audio driver to none, adstatus sent a clear, and just a single clear message - as expected. 

However, when I changed back to "core audio" it would send out a bunch of messages with strange (to me) behaviour.  Its like it repeated itself entirely - but also, the "set 2" messages (to get the current list of inputs) seemed repeated for no reason at all.

Output changing from "none" to "core audio"

Note getting everything twice - and many "set 2"'s in a row (not exactly doubled completely)

I'm kinda at sea as to why its happening.  Is it because the Audio Status menu is actually itself just using adstatus?  But then why the odd "set 2" behaviours?

Has anyone got any ideas on what is occuring here?  It actually completely explains some other behaviours I saw when trying to implement my reconnect function in entirely different ways - likely even leading me to abandoning the direction and trying something else new.

trying-to-understand-adstatus-behaviour

Trying to understand adstatus behaviour

R_Gol

I would like to generate a list of 127 frequencies from a list of 5-12 frequencies.

so if I will input 5 numbers: 220, 270, 300, 355, 440 the output will be a total of 127 numbers above and below those numbers

kind of deciding a list of frequencies/notes in one octave range and then creating those frequencies in different octaves/ranges (above and below that octave)

the idea is similar for the js scl reader.js object but instead of pre writing a file with a list of ratios/cents you enter a list of frequencies instead.

I would like to generate a list of 127 frequencies from a list of 5-12 frequencies. 

so  if I will input 5 numbers: 220, 270, 300, 355, 440 the output will be a total of 127 numbers above and below those numbers 

the idea is similar for the js scl reader.js object but instead of pre writing a file with a list of ratios/cents you enter a list of frequencies instead. 

I would like to generate a list of 127 frequencies from a list of 5-12 frequencies. 
so  if I will input 5 numbers: 220, 270, 300, 355, 440 

generate-a-list-of-frequencies-above-and-below-specific-range


creating octaves is *2 and /2.

but first find out which octave the given values are in, by ftom -> / 12(int) -> + 1


I'm not sure I understand what do you mean by  /12(int) ?

"so  if I will input 5 numbers: 220, 270, 300, 355, 440 the output will be a total of
127 numbers above and below those numbers "

if your list is one octave spread and you want to produce a list with total
127 items you can divide and multiply it by 2 to get your 127 frequencies.
or are they 128 all together - as midi notes ?

you run the list through vexpr $f1*2   and vexpr $f1/2 using scalarmode 1
and keep doing so till both produce enough values in both directions .

For example each vexpr can create as many items as (127???  / 2 - length of input list ).

from your example it is not possible to recognise any
preferences in terms of min / max freq range
or any other rules, so why not the joke above ?


i think he means within 0-127, not 127 values.

if that were 128 midi notes  that would trigger 128 frequencies

then ...
one could determine octave from the input list and
create more or less frequencies in one or the other direction, depending on prefered freq range.
but in case of 5 notes list, it would produce much wider freq range than 12 note input.
that example: 220, 270, 300, 355, 440
would end in 25.6 octaves, lowest freq 0.00412  and highest 17694720 Hz,
if spread in both directions equally.

Makes no sense at all, if it has anything to do with audible freq range,
unless all this is just a mathematical exercise.



 How do I create a frequency list in Excel?Note: You also can use this formula =COUNTIF(A1:A10,"AAA-1") to count the frequency of a specific value. A1:A10 is the data range, and AAA-1 is the value you want to count, you can change them as you need, and with this formula, you just need to press Enter key to get the result. 

Generate a list of frequencies above and below specific range

James Kelleher

I'm making my way through Cipriani and Giri, got to the point where we start playing around with the 

 object. I'm confused when they say "each pixel drawn represents a fixed number of samples". In what way are the samples represented? Are they just being averaged out? If I have a buffer size of 128 and calccount of 2, will the oscilloscope display 64 pixels?

I don't understand what calccount "samples per pixel" means.

i-dont-understand-what-calccount-samples-per-pixel-means

I am trying to use a poly~patcher to create midi data that is sent to mpeformat, but I can't assign the voice number from within the poly.

The use case I'm trying to solve is converting touch data from an Erae interface into mpe output. The data is arriving into Max via OSC and I'm packing it into a dict that is sent to the poly~. The reference point for this approach is the 'Contacts to MPE' project by Sensel which also uses a dict to store the raw touch data (x, y, pressure) and send it to a poly~.

https://github.com/sensel/C74-Max-Examples/tree/master/Contacts%20To%20MPE

The problem is that I need to use an id value from the dict to assign a midi channel to the data but I don't know if midiformat even works that way inside a poly~. 

Is there a way to use a poly~ to generate midi data and assign the voice or midi channel number from inside the poly~ itself?

Attached are screenshots of the poly patcher and the parent patch that is sending the dict into it and routing the output to mpeformat.

Using [midiformat] inside a [poly~] to assign voice/midi channel

using-midiformat-inside-a-poly-to-assign-voicemidi-channel

could you explain to me the specific use of 

, and in which context it is used? thank you

Hi everybody! 
could you explain to me the specific use of defer and deferlow, and in which context it is used? thank you

defer-deferlow


let´s start with defer, which is relatively simple.

if you are in overdrive and connect

[metro]
[defer]

metro will output its data into the high priority thread of max runtime, but after defer it will be moved back to the main thread again. (to do the opposite you can use pipe 0. or del 0.)

so for example i sometimes do this:

[sequencer clocked, timecritical data in overdrive]
/ /
[defer]  [complicated math for audio DSP] 
/
[complicated math for GUI object] 

to free up some space in the scheduler thread.

some other things are more on a trial and error basis. for example defer and deferlow sometimes fix issues with loading files on patch init or queueing bugs around [bpatcher]

there is a good article somewhere here about all this stuff.


One source of information on the scheduler vs low-priority threads:
https://cycling74.com/articles/event-priority-in-max-scheduler-vs-queue/
You might also have a look at the cousin object [jit.qball].
When you use defer objects, keep in mind this possible side effect: a carefully sequenced [t b b i b] will execute correctly in the high priority thread when triggered by, say, a MIDI event; now, if you connect a [defer]/[deferlow] on the rightmost outlet, then the order of execution will not be guarranteed.

thank you very much, I needed to know just these things.

@roman as I understand it, defer is used to switch from high priority thread to main thread, and pipe 0. or del 0. to do the reverse process. But why is the complicated math for audio DSPs (I imagine processes using FFT) left out of the high priority thread? Couldn't there be glitch problems in this case?

These are three different threads:
- the audio thread (MSP) is generally the highest priority
- the high priority Max events thread (things triggered by MIDI, [metro], etc.)
- the low priority Max events thread (things triggered by the mouse, [qmetro], etc.)
On this topic, the discussion I linked above is excellent.

The article Jean-Francois links to explains this, but the other wrinkle is that if you select "Audio Interrupt" in the audio status settings, then the high priority thread *is* the audio thread (thus there are only two threads), and that thread alternates between handing events on the high priority event queue and rendering the dsp vector. This may or may not be what you want, so worth testing out. 

MaxMSP Forum