Hello,

I was looking through the manual, does this help?

"About 20-, 24- and 32-bit float files

You do not need a 20- or 24-bit audio card to take advantage of the fact that WaveLab can handle 20- and 24-bit audio files. Any processing or editing performed on the files is always done at full resolution, even if your card doesn’t support the full resolution. For playback, WaveLab automatically adapts to whatever card you have installed."

I know its from the section before what you are quoting about 32 bit files. I would imagine though that what it is saying about 20 to 24 bit sound card processing is the same as 32 bit. Wavelab adapts the sound card being used for playback.