I noticed the tape out and VCR out on my XR45 to also be low in volume when connected to an external amp and playing a digital source. I think the VCR and TAPE out acts as a loop and requires the corresponding VCR and TAPE ins to be at optimal volume. Using the VCR and TAPE out for outputting other connections result to low fading volume.
The second audio out on the XR45 seems to output at a much higher volume. The only negative thing about the second audio out is that it only pass analog signals and not digital signals.
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