making a delay with feedback

[Atte]

Hi

I'm struggling to make (what would seem) a simple delay with variable
feedback. But no matter what I try it just won't behave. If someone
could make a simple example from the following (it's supposed to be
happening in an always-on output-module instrument), I'll be forever
grateful (and forever copy/paste'ing the code):

imaxdelay = 5; seconds
kdelay = 1; seconds
kfeedback = .5; 0-1
               ; 0 = no delay in output
               ; 1 = constant feedback, even if a_the_dry_signal stops

               ; sounding
asignal = a_the_dry_signal
; here should be the code to make the delay happen :-)
out asignal

I'm sorry about the newbie question, I never seemed to be able to wrap
my head around deltapi and friends.

--
Atte

http://atte.dk   http://modlys.dk   http://virb.com/atte


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[Iain McCurdy]

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Hi Atte,

something like this should work:

imaxdelay = 5; seconds
kdelay = 1; seconds
kfeedback = .5; 0-1
               ; 0 = no delay in output
               ; 1 = constant feedback, even if a_the_dry_signal stops
 
               ; sounding
asignal = a_the_dry_signal

afeedbacksig    init    0
abufout  delayr    imaxdelay
atap      deltap3    kdelay
delayw    asignal + afeedbacksig

afeedbacksig    =    atap*kfeedback ;used in the next k pass

out asignal

bye,
Iain

> Date: Tue, 23 Jun 2009 16:04:56 +0200
> From: atte.jensen@...
> To: csound@...
> Subject: [Csnd] making a delay with feedback
>
> Hi
>
> I'm struggling to make (what would seem) a simple delay with variable
> feedback. But no matter what I try it just won't behave. If someone
> could make a simple example from the following (it's supposed to be
> happening in an always-on output-module instrument), I'll be forever
> grateful (and forever copy/paste'ing the code):
>
> imaxdelay = 5; seconds
> kdelay = 1; seconds
> kfeedback = .5; 0-1
> ; 0 = no delay in output
> ; 1 = constant feedback, even if a_the_dry_signal stops
>
> ; sounding
> asignal = a_the_dry_signal
> ; here should be the code to make the delay happen :-)
> out asignal
>
> I'm sorry about the newbie question, I never seemed to be able to wrap
> my head around deltapi and friends.
>
> --
> Atte
>
> http://atte.dk http://modlys.dk http://virb.com/atte
>
>
> Send bugs reports to this list.
> To unsubscribe, send email sympa@... with body "unsubscribe csound"

---

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[Victor Lazzarini]

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I think it's probably best to do this:


abufout  delayr    imaxdelay
atap      deltap3    kdelay
delayw    asignal + atap*kfeedback

On a quick glance, my impression is that  the code below adds
1 extra k-period to the feedback path (but I
might be wrong on this).

Also, as a rule of thumb, setting ksmps=1 should be
a good thing too, in case you want to go down to 1-sample
and/or use variable delays (to have a fine degree of variability too).
Using an audio signal for delaytime also smooths things
in variable delays. You can place it in a UDO so that you
don't need to inflict the high kr on the whole of your orchestra.

Victor

----- Original Message -----
From: Iain McCurdy <i_mccurdy@...>
Date: Tuesday, June 23, 2009 4:13 pm
Subject: [Csnd] RE: making a delay with feedback
To: csound@...

>

>
>
>
>

> Hi Atte,
>
> something like this should work:
>
> imaxdelay = 5; seconds
> kdelay = 1; seconds
> kfeedback = .5; 0-1
>                ; 0 = no delay in output
>                ; 1 = constant feedback, even if a_the_dry_signal stops
>  
>                ; sounding
> asignal = a_the_dry_signal
>
> afeedbacksig    init    0
> abufout  delayr    imaxdelay
> atap      deltap3    kdelay
> delayw    asignal + afeedbacksig
>
> afeedbacksig    =    atap*kfeedback ;used in the next k pass
>
> out asignal
>
> bye,
> Iain
>
> > Date: Tue, 23 Jun 2009 16:04:56 +0200
> > From: atte.jensen@...
> > To: csound@...
> > Subject: [Csnd] making a delay with feedback
> >
> > Hi
> >
> > I'm struggling to make (what would seem) a simple delay with variable
> > feedback. But no matter what I try it just won't behave. If someone
> > could make a simple example from the following (it's supposed to be
> > happening in an always-on output-module instrument), I'll be forever
> > grateful (and forever copy/paste'ing the code):
> >
> > imaxdelay = 5; seconds
> > kdelay = 1; seconds
> > kfeedback = .5; 0-1
> > ; 0 = no delay in output
> > ; 1 = constant feedback, even if a_the_dry_signal stops
> >
> > ; sounding
> > asignal = a_the_dry_signal
> > ; here should be the code to make the delay happen :-)
> > out asignal
> >
> > I'm sorry about the newbie question, I never seemed to be able to wrap
> > my head around deltapi and friends.
> >
> > --
> > Atte
> >
> > http://atte.dk http://modlys.dk http://virb.com/atte
> >
> >
> > Send bugs reports to this list.
> > To unsubscribe, send email sympa@... with body "unsubscribe csound"
>

---

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>

Dr Victor Lazzarini, Senior Lecturer, Dept. of Music,National University of Ireland, Maynooth

[Atte]

Victor.Lazzarini@... wrote:

> abufout  delayr    imaxdelay
> atap      deltap3    kdelay
> delayw    asignal + atap*kfeedback

Thanks, this works.

The most stupid thing is I actually had this, but somehow forgot that
kdelay is in seconds (not ms) so I was operating out of range compared
to imaxdelay, and stupid me couldn't figure out why I was always hearing
the 5 seconds delay that was set by imaxdelay.

> Also, as a rule of thumb, setting ksmps=1 should be
> a good thing too, in case you want to go down to 1-sample
> and/or use variable delays (to have a fine degree of variability too).

This is a realtime orchestra, so unfortunately ksmp=1 is not gonna work.
However 1 sample delay is not gonna happen in this case. I am, however,
using variable delays, how would I benefit from having ksmp=1 in this
regard?

--
Atte

http://atte.dk   http://modlys.dk   http://virb.com/atte


Send bugs reports to this list.
To unsubscribe, send email sympa@... with body "unsubscribe csound"

[Victor Lazzarini]

you can ignore my advice then.

Victor
----- Original Message -----
From: "Atte Andre Jensen" <atte.jensen@...>
To: <csound@...>
Sent: Wednesday, June 24, 2009 2:04 AM
Subject: [Csnd] Re: Re: RE: making a delay with feedback

> Victor.Lazzarini@... wrote:
>
>> abufout  delayr    imaxdelay
>> atap      deltap3    kdelay
>> delayw    asignal + atap*kfeedback
>
> Thanks, this works.
>
> The most stupid thing is I actually had this, but somehow forgot that
> kdelay is in seconds (not ms) so I was operating out of range compared to
> imaxdelay, and stupid me couldn't figure out why I was always hearing the
> 5 seconds delay that was set by imaxdelay.
>
>> Also, as a rule of thumb, setting ksmps=1 should be
>> a good thing too, in case you want to go down to 1-sample
>> and/or use variable delays (to have a fine degree of variability too).
>
> This is a realtime orchestra, so unfortunately ksmp=1 is not gonna work.
> However 1 sample delay is not gonna happen in this case. I am, however,
> using variable delays, how would I benefit from having ksmp=1 in this
> regard?
>
> --
> Atte
>
> http://atte.dk   http://modlys.dk   http://virb.com/atte
>
>
> Send bugs reports to this list.
> To unsubscribe, send email sympa@... with body "unsubscribe
> csound"

Send bugs reports to this list.
To unsubscribe, send email sympa@... with body "unsubscribe csound"

[Atte]

victor wrote:
> you can ignore my advice then.

Ok, thanks for the help.

--
Atte

http://atte.dk   http://modlys.dk   http://virb.com/atte


Send bugs reports to this list.
To unsubscribe, send email sympa@... with body "unsubscribe csound"