Like you, I did not want to have to redo my cabling for different uses, so I switched to a Topping A90 amp that also doubles as a preamp with 2 sets of inputs and outputs. On the other hand, I did find that a good pairing of a headphone amp and headphones is a much more noticeable component of a rig as I was able to get noticeably more punch and depth, and was especially necessary until I switched to cans that were easier to drive. dedicated audiophile systems while playing is not possible to notice when my mind is preoccupied with its concentration on playing. What I found in my own experiences is the potential differences between the DAC from a modeler vs. I am a bit surprised with the implication that you did not have latency issues running your FM3 digitally through your DAC. When I tried running the digital out from my Axe II through my prior DAC/headphone amp setup, Chord Hugo I, the latency on the playing part was so bad it was a deal killer (and I am not overly sensitive to latency).
