If you still have problems you can try enabling all the devices, because some audio cards can be made to work only by emulating another card. Many chipset make use of the SoundBlaster and OPL compatibility, but a great number of them work with the WSS emulation. Many audio cards rely on this component or on a compatible one. Wss is the name of the NetBSD kernel driver which supports the audio system of Microsoft Windows. When everything works you can disable in the kernel configuration file the devices that you don't need.
Advanced commands NetBSD comes with a number of commands that deal with audio devices.
This command is used to configure the audio mixing and has an interface similar to that of audioctl.