I'm probably going to buy an analog Dolby B unit for playing back a number of stereo sources. There are a surprising number of really great digital titles that the engineer reproduced and neglected to apply Dolby B on playback that are begging for it. For example, the UHQCD release of "This is the Moody Blues" in MQA decodes to 352.8 with great detail, but it has that telltale high end that I remember from playing my cassettes in my car.\n\nThe title that is prompting me to write this is Bridge Over Troubled Water in Quad, Roy Hallee Mix. Wow, what a great album. But. I'd need two analog dolby units for this, so I thought maybe Foobar2000 has a component for this but, no such luck. In the digital domain, I think this might be challenging because it's a smooth curve that would need to increase amplitude as frequency increases. While I know a lot about signal processing and programming, I'm not quite sure how I'd write such code to do this smoothly. To say nothing of the calibration routine that would accompany it.\n\nDoes anyone have a solution for true, accurate, playback Dolby B for multchannel, PCM sources?