Starting with build 93, OpenSolaris will no longer have support for the ISA based SoundBlaster Pro, SoundBlaster 16, and SoundBlaster AWE32 devices. This shouldn't impact anyone, although its possible that bochs or qemu users may be impacted. (I've not heard of any such users successfully able to use the sbpro driver in a Solaris guest environment though.)
In the future, we may look into adding support for emulated ESS 1370 devices.
In the meantime, VirtualBox emulates an Intel ICH based AC'97 support, which works with the audio810 driver.