20   def opsIsChannel(self, dir, chn):  argument
21     return chn >= 0 and chn < self.channels
100   def opsGetVolume(self, dir, chn):  argument
101     return (0, self.volumeToUser(self.volumeinfo[dir], dir, self.volumearray[dir][chn]))
103   def opsSetVolume(self, dir, chn, value):  argument
105     if self.volumearray[dir][chn] == val:
107     self.volumearray[dir][chn] = val
112   def opsGetSwitch(self, dir, chn):  argument
113     return (0, self.switcharray[dir][chn])
115   def opsSetSwitch(self, dir, chn, value):  argument
116     if self.switcharray[dir][chn] and value:
118     if not self.switcharray[dir][chn] and not value:
162   def opsGetEnumItem(self, chn):  argument
163     if chn >= self.channels:
165     return (0, self.enumarray[chn])
167   def opsSetEnumItem(self, chn, value):  argument
168     if chn >= self.channels:
170     if self.enumarray[chn] == value:
172     self.enumarray[chn] = int(value)