ref: dd82b657c0a92a5e8f2d3df6c7ca3ae83403ce91
dir: /sys/src/games/music/debug.h/
extern int debug;
enum {
DBGSERVER = 0x01,
DBGCONTROL = 0x02,
DBGCTLGRP = 0x04,
DBGPICKLE = 0x08,
DBGSTATE = 0x10,
DBGPLAY = 0x20,
DBGPUMP = 0x40,
DBGTHREAD = 0x80,
DBGFILEDUMP = 0x100,
};