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DC-Block: Just think about what will happen if you connect a headphone at the end with an dc-OFFSET.
In my point of view, scaling in this case is similar to amplify. Maybe the output power level is insufficient.
I think that output of "Stereo Formation" block is connected to the chain: DAC -> LPF -> amplifier -> headphone.
As a rule, amplifier have capacitor on input to filter DC. So, why is it important to filter DC by DSP?
Ok, so in this case the dc-offset maybe disturb the deemphasis or stereo formation. In stereo-formation also the dc-offsets are summed and subtracted. And maybe you get a range problem if you have twice the dc-offset + signal. Scale can be used to to normalize the signal, based on some algorithm, to full range.
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