Edsonic
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Hello again.
To address the questions in the OP: using the tape loop (option 1), the tape-out (Rec) bypasses the the volume control, so then, e.g., the 2V or 4V signal from a DAC would essentially go through the tape-out "as is," thence the Zrock input. The Zrock manual states a max input of 4V, so that should work. (Phono, radio, etc. would be lower output than any DAC.) Then of course the output of the Zrock returns to the preamp via the tape input (Play).
This method places the Zrock between the source and the preamp, and the volume is used as normally, to control signal level to the amplifier.
Option 2 places the Zrock between the preamp and amplifier, so the preamp volume now controls signal level to the Zrock. Once the Zrock settings are where you like, the volume still functionally controls level to the amplifier, albeit indirectly.
All input/output impedance ratios are well within bounds using either method.
Read the posts below for discussion of "where in the chain."
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