Azdens fmx 42 portable mixer has been trusted by audio professionals in the field for over a decade its extensive set of features handcrafted quality and affordability have made it one of the most popular portable mixers on the market now with the new fmx 42u azden has added a usb digital audio output for even more flexibility the usb out on the fmx 42u is designed to connect to a computer smartphone or tablet and acts as a secondary stereo audio output necessary usb cables and adapters