Combined my headphone and speaker rigs using the M-Stage to bridge the gap and it is working very well in preamp duty as well as headphone duty. Makes controlling my speaker amp (no remote) a breeze since the M-Stage is on a small table next to my chair with my headphone stuff.
forgot to mention mine is also doing this. Really solid without any distortion or pops. Wish there preamp would cut off if the headphone was plugged in, but I found a work around. Sounds great with my Airmotiv 4s