AudioEnableFlag = enum
  Ch1Enable = 0, Ch2Enable, Ch3Enable, Ch4Enable, EnableAll = 7

AudioEnableFlags = set[AudioEnableFlag]

AudioTerminal = enum
  Ch1R = 0, Ch2R, Ch3R, Ch4R, Ch1L, Ch2L, Ch3L, Ch4L

AudioTerminals = set[AudioTerminal]

AudioEnable: ptr AudioEnableFlags = 0xFF26'u16

AudioTerminalOutput: ptr AudioTerminals = 0xFF25'u16