The free version of Shoutcast v2.6 is limited to 128kbps MP3 encoder only. Using AAC encoder or higher bitrate than 128kbps on ShoutCast v2.6 will result sound cuts. Both AutoDJ and Live Stream. If you have a premium service from the shoutcast company, add your userid and license id on the SonicPanel for AAC stream or prefer ShoutCast v2.5