I downloaded VClock and could not get play16 to redirect to AHI in the
way you are trying too either.
The solution for me when I get programs like VClock is to use the
Amiga's standard output. I have run a cable from the Amiga's RCA
output to the Toccata's AUX2 input and then set the software mixer to
half volume for "AUX2". I do not know what software you have for your
card but there could be a similar mixer that you can use with the
soundblaster's "MIC" input?
This method works on Workbench's Error sound and system (but not AHI)
friendly games.