Can I use ONE's internal mic, external XLR mic, or 1/4" instrument input at the same time?

With the 1st generation ONE, only one input can be used at a time, be it the internal microphone, external microphone (XLR) or instrument input.

With ONE iPad / Mac you can use the inputs as follows: 1) Internal Microphone + Instrument Input (1/4 ") at the same time 2) External Microphone (XLR) + Instrument Input (1/4") to Same time