[LAU] Dual Delta Setup

Hi all, Having recently acquired a second Delta 1010 for my setup I've been trying to run the two in tandem using the alsa Multi hack. I'm getting the xruns that I understand are expected but harmless[1] but I'm also getting some audible ones, which are obviously more of a problem. They're synched via the S/PDIF link and running either card on its own seems pretty solid. I've seen on various mailing lists people talking about digging into this but not found any conclusions. Is anyone here running dual Delta 1010s who can double check I'm running the latest recommended settings? I'm on a dual core 2.3GHz Athlon (4450e), running linux 3.2.0-2-rt with cpu scaling disabled, and the cards have exclusive use of IRQs 17 and 18. Jack is running at 44.1KHz with 6 frames and 64 periods, audio IRQs at rtprio 85 and Jack at rtprio 82. bjb [1] http://www.jrigg.co.uk/linuxaudio/ice1712multi.html