Add the control at the inputs, before the coupling capacitors (or delete them).
Use a 100k stereo volume control, but a range of values could work,
depending on the source. The wiper goes to the capacitor (or grid).
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Let's keep this simple. Insert either a ganged, stereo, or 2X mono log. taper pots. between the I/P jacks and the 0.047 μF. capacitors. Use 50 Kohms for the control value. Connect the "hot" jack terminals to the control "tops". Connect the control wipers to the 0.047 μF. capacitors. The control "bottoms" get grounded.
Yes, although perhaps a 10k volume control would be even better with the DAC.
These volume controls are very good.
DACT Type SMD Stepped Attenuator 21 step volume control pot D Shape Shaft | eBay
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"Standard" practice is for the O/P impedance of a driving component to be 1/10 the I/P impedance of the driven component. 50 Kohms is, for practical purposes, 1/10 of 470 Kohms.
Commercial products will be capable of driving the IHF 10 Kohm "standard". If the DAC is a commercial product, 10 Kohms as the control value is fine. OTOH, a DIY unit might not do well into 10 Kohms.
As the OP hails from Canada, exchange rates and possible import duties suggest that a product of Canadian manufacture could work out better than something from Hong Kong. I suggest that PEC KA and KKA series hot molded parts be looked into. BTW, the PEC stuff could easily be better sounding. Look here for DigiKey's Canadian site.
Commercial products will be capable of driving the IHF 10 Kohm "standard". If the DAC is a commercial product, 10 Kohms as the control value is fine. OTOH, a DIY unit might not do well into 10 Kohms.
As the OP hails from Canada, exchange rates and possible import duties suggest that a product of Canadian manufacture could work out better than something from Hong Kong. I suggest that PEC KA and KKA series hot molded parts be looked into. BTW, the PEC stuff could easily be better sounding. Look here for DigiKey's Canadian site.
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