Int 66 Fn 068C  - IBMsnd Driver - Report Audio Driver Capabilities         [s]

   AX = 068Ch

Return: AX = capabilities (see below)
   DX = playback rate if fixed-frequency playback

See Also: AX=0689h,AX=068Dh

Bitfields for capabilities:
 bit 0 can play audio in background
 bit 1 data is massaged
 bit 2 driver plays at fixed frequency, resampling input data to fit
 bit 3 driver uses timer interrupt