Looking for any 5.1 receiver having .5dB steps (or smaller) for the volume & L-R balance controls. Do any exist? Second priority is pure musical sound quality, while features are lowest in priority. My reference for two channel stereo is very high, Ampzilla monoblocs/VMPS RM40 TRT ribbons. I'm not expecting this level of refinement in 5.1, but must have at minimum very high musical performance. Many thanks for your time.