[PD] pd~ fifo latency

[puredata at 11h11.com]

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