MThd MTrk Q 6 X Y / MTrk ! d e d e f f @ @ ] ] [ [ LPLP NPNP OPOP LPLP NPNP OPOP JPJP LPLP NPNP JPJP LPLP NPNP HPHP JPJP LPLP HPHP JPJP LPLP JPJP LPLP NPNP JPJP LPLP NPNP OPOP NPNP LPLP JPJP HPHP GPGP EPEP CPCP BPBP @P@P >P>P <P