adding a silent channel to 4.0 files 2019-03-27 21:19:52 Some devices, I've found, can play 4.0 files properly, and some can't. The fix for the latter is to add a silent Center (and/or LFE) channel. I know how to add a channel using ,say, Audacity, on a per file basis. But I've got dozens of 4.0 files in my collection. Is there any software/workflow that can automatically batch-add a silent channel to them?