| Microsoft DirectX 9.0 SDK Update (October 2004) | 
The sysex track chunk contains data for a Track Form. It is an array of system exclusive message items, each consisting of a DMUS_IO_SYSEX_ITEM structure followed by the number of bytes specified in the dwSysExLength member.
<syex-ck> -> 'syex' (
  {
  <DMUS_IO_SYSEX_ITEM>
  <BYTE>...   // Data
  }...
  )