Thank you Michael for trying to assist. I am running Switch version 1.31 which I purchased several months, (but less than 1 year) ago. I have noticed that some music files on my computer play at a reduced volume, and I further understand the why of that. I am trying to normalize the sound volume between files all to a common volume. I thought the name for this was normalizing, but I may be off base there. In attempting that, I opened Switch, went into options, and then into conversions. From there I checked the box in auto processing normalize files while converting. I then set about converting a folder of MP3 files, but fortunately I checked the folder very soon to see what was happening, and several files had converted, but the file size was 0.0 where before the file size varied, but were mostly from 700 to 900 kb in size. I tried to play one of these 0.0 files and there was zero audio in the file. The audio had been completely stripped from the file.