if you follow the instructions at the top of the header for registaring your software on the fourm,that should give you access to the update section once updated give a little more info as to your set up,and particulars to your problem,. if there are no other topics that realate to your problem ,the info posted will help us assist you there was a recent posting realating to mp4 files, i think the solution was to convert to mp3, not 100% shure, but it can be resolved and welcome to mixvibes fourm
if you use the search function in the fourm for m4a it will take you to the pertant postings and resolutions
January 2012 Mixvibes DJ of the month MEMBER OF: C00l People MV Society
2014 dell XPS8700 intel core i5 4400@3.10ghz 12 gigs DDR3 ram NVDIA GeForce GT635 Win 10 /64 bits OS Realteck 7.1 Home USB sound dogle Asus VE247H monitor Logitec G-15 ser 1 gaming keyboard U-Mix Control Pro 2