I just tried this (on Linux) -- I get a delay of 64 samples with -fifo 1 (as I was hoping for), but Pd hangs if I start a pd~ subprocess with -fifo 0.

(I think it's reasonable to enforce a minimum fifo of 1 block since 0 block delay woud make pd~ less efficient than simply putting everything in one process :)

Anyhow, what OS are you on? It seems that, on your OS, the fifo is magically being decreased by 1, so that you're getting 4 by default (should be 5). If you speify 2 under these conditions you should get the minimum possible: 64-sample (1 block) delay.

thanks Miller

On Mon, Jan 27, 2014 at 07:51:00PM -0500, puredata@11h11.com wrote:

hi all,

in [pd~] documentation: -fifo <n> sets round-trip delay in blocks

when trying to use -fifo 0 or -fifo 1 (i want the lowest delay possible) = pd hangs. when not specifying -fifo i get 256 samples of delay (adding 5ms to my 13ms round-trip latency).

how to have just 1 sample delay with [pd~]?

i short video showing -fifo 20 delay: https://dl.dropboxusercontent.com/u/1455235/pdlatency.webm

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