A couple of days ago a good friend of mine came to my house to listen to the R2R 7. My friend builds some state-of-the-art servers, so he did bring one of them to audition.
First listening session was with stock settings: OS x8, PLL OFF (smooth fw), then switched to OS x1 (NOS w/digital filter), then S2 jumper ON for NOS mode 3 and finally mode 2. We did back and forth several times. We both agreed that NOS mode 3 was clearly the best one off al those combinations above, better timbre, faster bass response, better image positioning, less dull. Finally we gave a chance to PLL ON, which didn't bring anything better to the equation.
We then switched to his Orfeo Server. We did the same procedure, this time the differences were clearer, NOS mode 3 was the clear winner. So, cover back on and NOS mode 3 was caged (just as with my previous NOS 5).
Later on, I will do the same procedure for Accurate fw.
BTW, he also brought his Gustard Dac X-20 to A/B with the R2R 7, not a fair contest but we did it anyways. As expected, R2R 7 give the Gustard a good ride through the park.