I think on the transport it send out only digital signal. And digital is just 0 and 1. it will not have volume control. Volume control come in after the D/A convertion.
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I agree with Waip7 in addition if you want to send a digital signal to the amps convertors. Are you referring to D/A convertors that exist in the amp? That would make that a pre-amp-processor. If you are intending to send a digital signal to an amp, you will have no music. The digital signal must be converted to analog first then add the volume control.
Although that is technically possible, I have never heard of a CDT with build-in digital volume control. If you wanna run your DACs directly to the power amps, you may consider Z-Systems RDP-1 or TacT RCS for digital attenuation purposes. I have had the TacT RCS on loan, and inserted between my Theta CDT and Theta DAC, RCS sounded much better than my Krell KRC-3 preamp.
I have an older Goldmund VSR alize 3 DAC and when I hook a cheap DVD player with volume control to the DAC I can attenuate the volume. Although the quality is not as good as with a proper transport. SO, DVD digital outputs are indeed controlled with the volume on remote; at least with my Goldmund DAC.