Let's face it, many of us use smartphones as the source and don't want to lug around three items. My smartphones are not powerful enough to drive all the headphones I want to use, hence the need for an external amp. Then again, I want to speak to my headphone/IEMs inline microphone, not to the mic. Thus, the question: does any manufacturer make a headphone amp with either USB-C or analog 3.5mm input such that it passes through the microphone signal through itself from the headset to the phone? Perhaps this has been covered, but I could not find by searching.