Hello, My question is in the subject: Do the use of 2 units linked decrease the DSP load? I'm currently using a Focusrite Saffire Pro 40 with FFADO 2.1 and jackdmp on a Core2Quad Q6600 processed machine with 8 Gb RAM. The setup I use loads the DSP at 65%. If I add a new Focusrite Saffire Pro 40, chained to the first one, will the DSP load decrease? *Discussion you may not want to read* I'm at a point where I must increase the performance of my machine, as I will pass from 8 analog ins and 10 analog outs to 24 ins and 8 outs. I've tried my current setup (same softs, same machine) with a RME HDSP 9652, and came to a DSP load of 35%. I now have two options: 1. buy a RME HDSP 9652, use my Focusrite Saffire Pro 40 as a 8-Pres unit coming through ADAT to the RME, and buy 2 more Octopre or Saffire Pro 40. + : DSP load is lower + : RME clock is better than the Focusrite one + : use of a PCI device => no use of FireWire, less cables, use of stable drivers (already packaged in Debian) - : more expensive (about 1250 €) - : this setup is limited to 24 analog ins, and cannot be raised easily[1] 2. buy another Saffire Pro 40, linked to the first one, and then buying only one OctoPre. + : cheaper (about 850 €) + : this setup can be easily upgraded to a 32 analog ins[1] + : more outs and more S/PDIF ins +/- ? : DSP load decreased with link of the unit? - : DSP load for one unit is higher [1] One of my jobs is to make live sounds, and with such a system, I'm able to replace a analog mixer for FOH, coming to a solution looking like LS-9 (with better pres) and other digital mixers. Last but not least, last time I wondered about the use of DSP in GNU/Linux, I finally understood that the DSP of audio interfaces weren't use under GNU/Linux. Am I wrong? Is it always true? If yes, how does it come that for a very same PC/software setup the RME (PCI, so alsa driver) DSP load is twice lower than the Focusrite (FireWire so FFADO) one? Thanks a lot. -- Aurélien