I use the volume control on my Lavry DA-10. According to the manual, it's a digitally controlled analog control. I drive my amp with the DA-10, which I find sounds a bit more transparent than going through my pre-amp. I've also tried using the digital volume control in JRiver Music Center. I'm aware that there's some controversy about using a digital volume control (throwing away bits, some state), but from what I read that is an unsettled matter. I can't hear any difference between using the analog volume control on my DA-10 and the digital control in JRiver.
I've been thinking about the same question as posed in your thread. I'm interested, as well, in remote control of the DAC's volume control.
Rich