The mp3 audio in a video prepared with VMS 13 , when loaded into Vegas 16 ( or Vegas 15 Pro) screeches. I note that checking Properties of track in the VMS13 load it uses plugin mp3plug2.dll, ( i.e. MP3 Audio) however Vegas 16 and Pro15 use mcplug2.dll, ( i.e Main Concept MPEG-1) even though it is same video and same audio. The mp3plug2.dll is in the V16 and the Vegas 15 Pro File I/O file plug-in file. How can I make the mp3plug2.dll the default plug-in so that V16 recognizes mp3 files and plays them properly? The suggestion using Options/SHIFT Properties/Internal/compound and changing usage of Enable So4 Compound Reader for AVC/M2TS from True to False do not work. Would appreciate suggestions as it appears to be a widespread problem with MP3 and VMS.