latency between devices when using Audio Midi Setup's Aggregate Devices?

OK, i've done a quick test by making the firepod the master clock, and tascam a slave by receiving the clock via it's SPDIF in.

I physically hooked up the coax out of the firepod to the coax in of the 1082, and also hooked the coax out of the 1082 to the coax in of the firepod.

at 48kHz, it seems to have worked! i don't have any latency/delay on the snare recording between the different mic pre's.

I'll try to do more extensive testing as i have time. One thing to note is that presonus states they the firepods can be chained up to 3, but it will only support a max of 48khz. I wonder if it will do 96khz with my tascam somehow...but maybe it's a hardware limitation (clock jitter etc...)

according to the tascam manual for the fw1082, the sample rate selection in it's control panel manager software menu selects the sample rate to the digital input (SPDIF) and the internal sampling frequency. So that basically means that the spdif should technically go to 96khz.

the presonus firepod limitation is something that is stated specifically on their website when chaining together 2 to 3 firepods using Aggregate devices on Tiger OsX. it says the firepod only supports max of 48khz.

yes, the next thing to try is to make the 1082 the master clock, output it via spdif and have the firepod receive it via it's spdif input. i didn't try it first because the firepod's clock settings only say "internal" (master), or "mac" (i presumed that means the clock comes from the firewire port from the mac); whereas the tascam says "internal" (master) or "spdif" (clock comes from spdif).

OK, i've tried using the tascam 1082 as master and firepod as slave, and the latency problem returns. i.e. This is with options for clock source: 1082 set as "internal" and firepod as "mac".

btw, the lag between the attacks of the waveforms is about 1/15 of a second (~62ms).

I'm going back to making the firepod master clock for spdif syncing.