Still using Sonar Platinum 2016.08 installed BandLab but missing features I use

[Noel Borthwick]

No the driver isn't filling with zeros. If its got DSP then its passing on the floating point sample data through the ASIO input. Here is an example of a device that supports floating point ASIO. We added support for this several years back.
If cakewalks record bit depth is set to 24 when the driver exposed 32 then we would be discarding the extra 8 bits permanently. Similar to if you set the record bit depth to 16 when the driver supports 24.