typedef struct SurgeCmdMsg {
  uint8_t type;
  union {
    // FOR SURGE_TYPE_SETRATE
    uint32_t newrate;
    // FOR SURGE_TYPE_FOCUS 
    uint16_t focusaddr;
  } args;

} __attribute__ ((packed)) SurgeCmdMsg;

enum {
  AM_SURGECMDMSG = 18
};