Peekcl()
Setup_p()
Set_p()
Set_ps()
Set_pp()
Caller()
Kill()
Join()
Index()
Player_stat has flag P_WRAP 
* Kill_test()
* Rhythm(), Pitch(), Key() and friends are not sensitive to Hold directive.
* P_KEYSIG
* P_METRONOME, Get_metronome(), use of MM postop, etc.
