Add a 4-bar ROCK GUNSHOT track in the following composition:
PS T4Q4 GMROCK KMG BM145 CMGQCQAQGQAm7b5 BL4 IL29Q73Q53Q81Q24Q0Q34Q0Q53 TS INST24 DN0 BS BE TE TS INST0 DN0 BS BE BS BE BS BE BS BE TE TS INST81 DN1 BS NO67 TD16X0 NOF67 BE BS NO67 TD8X0 NOF67 TD5X0 NO64 TD1X0 NOF64 NO64 TD1X0 NOF64 NO62 TD1X0 NOF62 BE BS NO64 TD2X0 NOF64 NO69 TD1X0 NOF69 NO69 TD2X0 NOF69 TD8X0 NO64 TD1X0 NOF64 NO64 TD1X0 NOF64 NO62 TD1X0 NOF62 BE BS NO64 TD2X0 NOF64 NO67 TD1X0 NOF67 NO67 TD2X0 NOF67 TD9X0 NO62 TD1X0 NOF62 NO60 TD1X0 NOF60 BE TE TS INST53 DN0 BS BE TE PE
TS INST0 DN3 BS NO67 NO64 TD4X0 NOF67 NOF64 NO67 NO64 TD4X0 NOF67 NOF64 NO60 NO64 TD2X0 NOF60 NOF64 NO62 NO66 TD2X0 NOF62 NOF66 TD2X0 NO64 NO67 TD2X0 NOF64 NOF67 BE BS NO64 NO67 TD4X0 NOF64 NOF67 NO64 NO67 TD4X0 NOF64 NOF67 NO67 NO64 TD4X0 NOF67 NOF64 NO67 NO64 TD4X0 NOF67 NOF64 BE BS NO69 NO64 TD4X0 NOF69 NOF64 NO69 NO64 TD4X0 NOF69 NOF64 NO64 NO69 TD4X0 NOF64 NOF69 NO69 NO64 TD4X0 NOF69 NOF64 BE BS NO67 NO62 TD4X0 NOF67 NOF62 NO67 NO62 TD4X0 NOF67 NOF62 NO67 NO62 TD4X0 NOF67 NOF62 NO67 NO62 TD4X0 NOF67 NOF62 BE TE