This chapter describes all of the supported QNX Sound Architecture (QSA) API functions, in alphabetical order; undocumented calls aren't supported.
The QSA has similarities to the Advanced Linux Sound Architecture (ALSA), but isn't compatible. Though the function names may be the same, there's no guarantee that QSA and ALSA calls behave the same; some definitely don't.
For an overview of what's in the documentation for a function, see the What's in a Function Description? chapter of the QNX Neutrino C Library Reference.