Check the listing for details. Roland GO:MIXER PRO-X Audio Mixer for Smartphones. Condition: New. Listed at 199.99 USD. High-performing Line Mixer with a Wealth of I/O Options The latest addition to Roland's GO:MIXER series is here in the GO:MIXER PRO-X — now with even more great features! This compact 9-channel audio line mixer is perfect for the musician or content creator on the go, with enough inputs to please even a small ensemble. The GO:MIXER PRO-X pre-mixes multiple sources of audio (guitar, keyboard, backing tracks, microphone, and more) down to a stereo track that's instantly exportable to your favorite streaming media service. Brand-new to this impressive audio mixer is a Guitar/Bass Input Attenuator switch for ensuring an optimized signal is hitting the mixer, as well as an upgraded headphone I/O for compatibility with a wider range of mic-equipped headsets and earbuds.