CHANNEL_0
page->audio.port[LEFT_PORT].channels = CHANNEL_0;
#define LEFT_CHANNEL CHANNEL_0
cdp->au.port[0].channels = CHANNEL_0;
error = acd_setchan(dev, CHANNEL_0|CHANNEL_1, CHANNEL_0|CHANNEL_1, 0,0);
error = acd_setchan(dev, CHANNEL_0, CHANNEL_1, 0, 0);
error = acd_setchan(dev, CHANNEL_0, CHANNEL_0, 0, 0);