it's documented in 2.5.2 http://msp.ucsd.edu/Pd_documentation/x2.htm and 3.1 http://msp.ucsd.edu/Pd_documentation/x3.htm of the Pd documentation, but I don't know who actually reads it...
 
BTW, the manual could need an update. For example, the section about dollarsymbols is outdated:
 
> Note that the expansion of variables such as $0 and $1 only works at the beginning of the symbol; so, for instance, "rats-$1" will not be expanded.
 
And the section "Audio in Microsoft Windows" talks about Win95/98 :-)
 
Christof
 
Gesendet: Donnerstag, 16. Mai 2019 um 13:31 Uhr
Von: "Dan Wilcox" <danomatika@gmail.com>
An: Miller <msp@ucsd.edu>
Cc: Pd-List <pd-list@lists.iem.at>, "Mario Buoninfante" <mario.buoninfante@gmail.com>
Betreff: Re: [PD] Delay (msec) option in audio properties
Is this in the Pd Manual somewhere? Could be a good point to add to future questions.
 
On May 16, 2019, at 12:00 PM, pd-list-request@lists.iem.at wrote:
 
From: Mario Buoninfante <mario.buoninfante@gmail.com>
To: Miller <msp@ucsd.edu>
Cc: pd-list <pd-list@lists.iem.at>
Subject: Re: [PD] Delay (msec) option in audio properties
Message-ID: <prv0jfua425kbuby0250gq1e.1557925987966@email.android.com>
Content-Type: text/plain; charset=utf-8

Hi Miller,

Thanks a lot for the explanation.

Cheers,
Mario

-- Electronic Musician, Creative Coder, QA Engineer https://vimeo.com/creativecodingsalernohttp://mbuoninfante.tumblr.com https://github.com/mariobuoninfante https://bitbucket.org/mariobuoninfante


On 14 May 2019 5:39 pm, Miller Puckette <msp@ucsd.edu> wrote:

Rough explanation:  Pd sets up two FIFOs, one for audio input and one for 
output, and "delay" sets the length of those FIFOs.  I/O is managed so that 
(in theory at least) the sum of the number of sample frames in the input 
and the output FIFOs add up to the "delay", plus or minus one 64-saple block. 

So theoretically at least, the total delay from audio input to output should 
be the sum of three things: this number, the OS's internal audio latency 
(which depends on all sorts of factors) and the A/D/A devices. 

cheers 
Miller 
 
--------
Dan Wilcox
 

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