This is just a guess, but after having a look at the ZIP from the link in the dez for the video ( http://tinyurl.com/sb16demo ), it appears to be a file that I uploaded here at Vogons some time ago.
Anyhoo, that ZIP file contains several versions of the "CT-VOICE" driver file (CT-VOICE.DRV), as well as several versions of the "FOOTSTEP" VOC sound file (FOOTSTEP.VOC).
The different versions of the files are:
In the ZIP file, the existing "FOOTSTEP.VOC" is copy of the "FOOTSTEP.SB" file (which is 8-bit), while the existing "CT-VOICE.DRV" in the ZIP is a copy of the "CT-VOICE.SB" file (which is the CT-VOICE driver for the original standard non-Pro Sound Blaster).
It's been a while, but IIRC the reason that I packaged this up like this was for use in DOSBox (to make it the most compatible with a default DOSBox installation, so's the demo would run properly), and the MMPLAY package (with the specific files copied to FOOTSTEP.VOC and CT-VOICE.DRV) was set up for a standard Sound Blaster (non-Pro version) with 8-bit sound.
I'm thinking that if you copy:
FOOTSTEP.16 to FOOTSTEP.VOC
CT-VOICE.16 to CT-VOICE.DRV
...overwriting the original files, it might just work for ya 😀
Like that, that's how the _original_ MMPLAY install was for the SB-16.