HI
Can you post an example so we can understand the issue?
Do you mean Echo?
Echo is “a repeated echo multiple times of the same audio” ie echo, cho. cho, cho
or do you mean a delay, where there is a repeat of audio but not multiples?
Do you really need 18 tracks on the go all at once. Are the tracks long and have no cuts in them?
Is your machine also trying to run multiple streams of hd video etc etc.
Perhaps you could try moving some audio clips to different drives, and try putting some cuts in them to give the computer to re sync. Does that help.?
Peter
Post Production Dubbing Mixer