AX functions are basically thread-safe, but the following functions are not.
AXInit
AXInitEx
AXInitSpecifyMem
AXInitExSpecifyMem
AXQuit
AXRegisterCallback
AXSetMode
AXSetMaxDspCycles
AXGetAuxACallback
AXGetAuxBCallback
AXGetAuxCCallback
AXSetMasterVolume
AXSetAuxAReturnVolume
AXSetAuxBReturnVolume
AXSetAuxCReturnVolume
AXInitProfile
AXSetCompressor
AXSetCompressorTable
AXRmtGetSamples
AXRmtAdvancePtr
The following functions are thread-safe as long as arguments do not overlap.
2008/12/17 Added functions.
2008/10/06 Initial version.
CONFIDENTIAL