B_CHANNEL_TOP_CENTER
{ "Top Center", 1, B_CHANNEL_TOP_CENTER },
{ B_CHANNEL_TOP_CENTER, B_CHANNEL_SURROUND_BUS },
#define B_CHANNEL_MONO B_CHANNEL_TOP_CENTER
if (channelMask & B_CHANNEL_TOP_CENTER) {
{ "Top ............ ", B_CHANNEL_TOP_CENTER },
| B_CHANNEL_TOP_BACK_CENTER | B_CHANNEL_TOP_CENTER