Hello! i got a tascam audio interface recently and i noticed that the headphone monitior output doesnt output all of the mics/ intruments i plug in. for example, if i plug in 2 mics using an xlr cable and a guitar, i can hear the guitar, or sometimes ill have two mics plugged in, and can only hear the one mic. The inputs im allowed to hear seem to be random as well. sometimes i can hear both mics, or 3 out of 4 mics and i have no idea why.