I somehow get the impression that you have no clue what I'm talking
about.
Section 4.6.1.1 of the USB Device Class Definition for Audio Devices
says:
The bmAttributes Field bits are set to reflect the isochronous type
of the endpoint. The synchronization type is indicated by D3..2 and
must be set to Asynchronous, Adaptive or Synchronous.
These types are explained in section 5.12.4.1 of the Universal Serial
Bus Specification Revision 2.0.
