Check the listing for details. Pro MP-1 Mixphone Multi-Mode Reference Headphones with Vari-Voice Black. Color: Black, Condition: Open box. Listed at 130.89 USD. The Avantone MP-1 Mixphones were created for the professional and end users that need more then just a standard set of headphones. Featuring Vari-Voice switching, High-end comfort, and a pleasing aesthetic, the Avatone MP-1 Mixphones are a perfect match for anyone in the music industry that cares about the sound they hear. Mixing engineer, recording artist, and live sound engineer, look no further.Vari-Voice Switching:Vari-Voice allows the user to move between normal neutral voiced stereo, mono, and mix mode that adds a bit of focus to the midrange to give you the same sound from Avatone's professional Mixcubes monitors in a headphone setting. Comfortable:The MP-1 Mixphones are designed with with very generous padding that encloses the ear lobe, providing comfort for long periods of.