Ok, so from that I understand NOS must be disabled to get the Darwin filters and other dsp effects to work, right?Quote from the HiBy RS6 web page [ https://store.hiby.com/products/hiby-rs6 ] -
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Switchable oversampling / NOS
NOS mode bypasses oversampling and antialiasing, responding instantaneously to transients and stairsteps, converting to analog in the most raw and direct manner possible; Oversampling mode removes aliasing artifacts, enables all functions of the Darwin architecture, realizes personalized adjustments of sound signature, adapting to different earphones
Still not sure where those other presets and filters come from, eg “post-Nyq shallow LP”, etc..