In reply to:

My dream is to be able to actually set its cutoff points...



Me too.
What I'd actually like is to be able to do is to set equaliser (or just loudness) values at intervals along the volume range and the player to interpolate the values inbetween. Thus giving a nice smooth loudness curve.
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Marcus 32 gig MKII (various colours) & 30gig MKIIa