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Conall Ó Maoláin

I'm working on a kind of spectrum visualiser. I'm using a multichannel FFT to get a range of signals at each frequency bin and display them in a kind of wave table form. In the jit.gen patch I had to separate each plane of the input matrix using the swiz operator but I'd like to be able to do this dynamically so I can use FFT's with higher resolutions without needing to add a bunch more swiz operators. 

I tried using javascript but it slows down the render rate too much. Can it be done at all?

Hello,

I'm working on a kind of spectrum visualiser. I'm using a multichannel FFT to get a range of signals at each frequency bin and...

dynamic-plane-separation-in-jitgen

Dynamic plane separation in Jit.gen

noddy-oer

Hello! I'm working on a gen~ patch that relies on using two separate counters to drive two peek objects. At certain points the counters become unsync'd and I'm looking for a way to send an instantaneous trigger into their middle inlets when a parameter changes value (it's a param that only goes from 0->1 or vice versa).

I tried just setting that param into the middle inlets but as expected that just sends a steady stream of samples with whatever value the param has, and so would re-trigger the counter once per-sample which is not what I want.

Any suggestions greatly appreciated, thanks!

Gen~: Instantaneous reset trigger for counters?

gen-instantaneous-reset-trigger-for-counters

Hello! I've made a delay/looper patch that allows the user to change the step-size used by the counter object that drives  peek and poke operations such that alters the speed of playback as in the example found in the Gen tutorials. Poke's @interp settings ensures everything sounds good no matter the setting, however driving peek with non-integer values produces some really nasty aliasing.

Is there any way to perform interpolation when using non-integer values with counter that's driving peek? @interp is suspiciously absent from its attribute list.

Hello! I've made a delay/looper patch that allows the user to change the step-size used by the counter object that drives  peek and poke...

driving-a-peek-counter-with-non-integer-step-size

Driving a peek counter with non-integer step-size 

soundyi

Essentially its about how does concat work - as the 

 are only hieroglyphs and I am in the lack of the Rosetta Stone.

The help inside gen is also - I am missing the words for it.

I could do some try and error to find it out (still leaving space for guesswork if I do not catch all possible cases), hence why are such fundamental things undocumented or do I miss something?

Essentially its about how does concat work - as the docs are only hieroglyphs and I am in the lack of the Rosetta Stone.

The help inside...

concat-what-does-the-3rd-arg-do

concat - what does the 3rd arg do

Hans Tammen

the @default parameter does not work in gen~. I see that this was a bug a few years ago that was fixed, but now it appears that it doesn't work again. Max 9.0.5

Hi,

the @default parameter does not work in gen~. I see that this was a bug a few years ago that was fixed, but now it appears that it...

default-wont-work-again

@default won't work (again)

Andrew Benson

While working on something, I needed a way to capture a sample and then loop it, but have the loop length dependent on the length of the recording. I whipped up a solution in Gen~ and thought it might be useful for someone else.

sample-and-loop

Fantastic bit of code. I just added functionality for length of loop and a reverse button. 


Also wouldn't be hard to add in a rate control (just multiply the sample playback increment before %). fun stuff


I seem to get either silence or white noise when speed isn't 1.


It looks very interesting but (I'm a total noob with gen) what is the advantage of doing it in gen~ rather than with the classic groove~ object ?

I'm currently building something for doing, more or less, the same thing and I didn't think of using gen~ 

Close, but the * should go before the + actually.  You are multiplying the increment amount to change speed.  With the speed control, I also switched to a higher-quality interpolation mode so I can buttery smooth slow-downs.  Try this:

@Spip The advantage - for me at least - is the ability to have a fairly fine-grained control over how it works, and be able to expand and alter that at will.  The groove~ object is a little bit of a black box that just works.  Also, with my version, the phase of the loop is in sync with the recording.  I could also expand this to do overdubbing with just a few more parts.  Also, the @interp options in the Gen~ objects sound really good.


Ah I see where I was going wrong. Sounds great! 

I just added a sync output like groove~ and an output for length of sample.

I'm trying to change the start point of the sample though without too much luck. 

I think this is what you want. This doesn't protect you from reading past the end of the buffer though, so you might want to further complicate that calculation by scaling the range based on length, or passing through % or something.


Thanks for posting this Andrew. Added a couple of simple things- stop, stutter, restart and overdub. I tried to use splat for the overdub and couldn't make it work. Could you post an example using splat? 

With splat you just divide the play position (in samples) by the buffer size, which you can get from the left outlet of the gen~ buffer object.  Otherwise it's basically the same as poke (from what I can tell), but with linear interpolation if you're playing at different speeds.


>I could also expand this to do overdubbing with just a few more parts

... well... if it isn't too much bother... I'd sure like to get off and running with a looper like that... :) Pretty please?


Here's a patch with all the above contributions including overdub...

It's such a privilege to be part of a community with so many smart, creative people. Not to mention generous. Thanks!!!


I know how to do this outside of gen~, but is there a way to ramp the attack/release inside gen~ to minimize clicks?


There's no rule that EVERYTHING has to happen inside the gen~ object. ;) That said, here is a simple way to do linear ramps between 0 and 1 for an A/R envelope.  Hope that helps.


Thank you, Andrew. :-) Just trying to keep learning all this wonderful new stuff.


Interpolation using [splat] seems to not work when referencing a buffer in reverse....am I doing something wrong, or is this not supported?  If not, is there a possibility that it will be, or am I going to have to build something that does this myself?  I'm trying to get rid of the need for ipoke~ in my tape looper patch.


I'm trying to fold it into a larger patch and i'm running into a couple noob roadblocks. First I'm trying to convert the gen looper to record in stereo (with the option of then controlling playback of each channel independently) so for example on play back the left channel could play forward and the right channel in reverse, or setting different start and end loop point. different speeds per channel etc.... I tried duplicating the inside of the gen~ changing the inputs on the copy but it's not wanting to record to a two channel buffer. 

The second question is, this will all live in a bpatcher of which i will load several instances of in a parent patcher and I've done this before by prefixing names in the bpatcher with #0. but when I try to use the #0 in the gen object to rename the buffer name i get a gen compile error saying that #0_lp is not a valid variable name. So I'm not sure how to get around that.

 Thanks for the help and the inspiring code to start with!
Attached is a copy of my hacked version which is not working correctly.


There's a couple of problems with that genpatcher -- first of all, the #0- prefixing doesn't work in gen patchers (and probably never will...). Instead, create a named buffer object (e.g. [buffer mybuf]) and in the parent Max patcher send a message "mybuf #0_lp" to the gen~. Also, [splat] does not support different @interp modes at the moment. 

I hope that helps. Here's the gen~ with those changes made:


Thanks Graham i will check that out and report back. Best!


I tried to modify the patch (Rick's version with overdub), so the loop will sync to the transport.  After a few hilarious attempts, I realized I may need help from people wiser than myself.

i would like to run 6 instances of this simultaneously but do not have gen!

would someone kindly post 6 versions of this that address buffers with different names?

Ever once in a while I come back to this patch and try and figure why the overdub part stopped working.
[Splat] use to need different timing information than [Poke]. From what I found that's no longer true.
They now seem to be the same except that [Splat] writes with linear interpolation between samples and
overdubs the new and old samples.

Anyway... here's a new working version and I added a new function, multiply I guess is the best name.
It's basically a new loop that runs in sync with the original recording, except that the new loop can be
two or three times or however many times as long as the original loop.


I’m very new to gen~ and trying to build a varispeed looper with overdub (i.e. what this patch does). I’ve got Max 7 and overdub wasn’t working properly, which I assume is because a) the new splat takes a sample or phase index just like the poke object (which Rick already noticed) and b) it automatically overdubs, i.e. mixes the incoming signal with the existing buffer (according to the mix value sent to the fourth inlet and the @overdubmode attribute). So I just stopped feeding the peak output into splat and it works like a charm (pasted below).

But I’ve run into a problem: I get quite a bit of high-frequency digital noise when overdubbing at any speed other than 1. A similar effect happens with the groove~/poke~ combination I was using before, but it’s much subtler and only appears after multiple overdubs. Can anyone reproduce this problem – and any ideas how to solve it?

(Audio interface is an Apogee One running @ 44.1 kHz, which usually gives pretty clean conversion.)

From what you're describing that sounds like interpolation issues. So if you record (or overdub) at a rate higher than 1. you aren't writing every consecutive sample, hence leaving empty samples. Which when you go to play back, gives you that alias-y type sound.

I've not mess with the gen objects/options too much but interpolation seems like it would be an attribute for the buffer/playback objects in gen.


Yes, skipped frames may very well be the problem. Except that I do have peek (the playback object) set to spline interpolation. Splat is supposed to write with interpolation as well. What’s strange is that this combo sounds _worse_ than my groove~/poke~ setup, even though gen~ has higher-quality interpolation. And with groove~/poke~, smearing happens gradually, after several passes (which is exactly what you’d expected with skipped frames), whereas in this ~gen patch, the signal gets severely distorted on the very first overdub. (I also tried the trick of writing 3 samples ahead/behind of playback in case the problem was caused by writing to the same buffer.)

Gen Forum