Is there a simple way to 'gate' Impulse

Questions
#1

I’ve been trying to imagine a very simple way to have impulse repeat certain rhythms in the manner of rhythmic modes or Carnatic jhatis.

For example a simple rhythm like: XXXO

In the above X would be an impulse and O a rest. I’m struggling to think of an elegant solution, and don’t want to use patterns.

Has anyone experimented with this?

Many thanks!

#2

It depends on what you mean by you don’t want to use patterns. If you mean the sequencing should happen on the server, then Demand ugens would be perfect.

1 Like
#3

You can use NamedControl for array args and a convenient interface, e.g.:


// quick example

(
x = { |unit = 0.2, freq = 400, length = 2, amp = 0.1|
	var maxLength = 20; // you have to define maximum length 
	var rhy = \rhy.kr(1 ! maxLength);	
	var trig = TDuty.ar(unit, 0, Dseq([Dser(rhy, length)], inf));
	Decay2.ar(trig) * SinOsc.ar(freq, 0, amp) ! 2
}.play
)

// normal setting

x.set(\rhy, [1, 0, 1, 1], \length, 4)


// helper Function for making an interface

(
~setRhy = { |synth, str = "X"|
	var arr = str.as(Array).collect { |ch| (ch == $X).if { 1 }{ 0 } };
	synth.set(\rhy, arr, \length, arr.size)
}
)

// apply

~setRhy.(x, "X00X00X0")

// tempo change

x.set(\unit, 0.15)

x.release
3 Likes
#4

Hi Thor, dkmayer,

Thank you so much for your responses.

Thor, you are correct, the Demand Ugens are highly relevant to what I am doing. Thanks for pointing me in the right direction.

dkmayer, apologies for not responding sooner. I wanted to get a moment to properly test you code and it hasn’t arrived for me, but it looks perfect. I will give it a spin as soon as possible. The helper function for the interface is really cool. I’d never have thought along those lines. I find making GUIs a bit tiresome, but this is a really nice in-between territory that had never crossed my mind. Really elegant, thank you!

Thank you both for helping me out, I was quite a way of from this so you have saved me a great deal of head-scratching!

Dom