I added recently a Schiit Magni+ to my chain. The way is: computer (or bluray, or tv) > smsl dac6 > Naim Nac62 > Naim Nap 90. As I'm lazy and don't want to switch cables I attached The Schiit at tape out of the Naim Pre. The Dac is set to fixed output. Volume is controlled by either the preamp...