dwm volume control

dwmconfig.h

/**
 * config.h 
 * ALT + F11 | F12 
 */

static const char *upvol[]   = { "amixer", "set", "Master", "3+",     NULL };
static const char *downvol[] = { "amixer", "set", "Master", "3-",     NULL };
static const char *mutevol[] = { "amixer", "set", "Master", "toggle", NULL };

static Key keys[] = {
	{ MODKEY,                       XK_F12,    spawn,          {.v = upvol   } },
	{ MODKEY,                       XK_F11,    spawn,          {.v = downvol } },
	{ MODKEY,                       XK_F9,     spawn,          {.v = mutevol } },
};

Great

If anyone's wondering why the vol up and down aren't working for them, just use sudo amixer in place of amixer

for people that use pamixer instead of amixer

 static const char *upvol[]   = { "pamixer", "--increase", "3", NULL };
 static const char *downvol[] = { "pamixer", "--decrease", "3", NULL };
 static const char *mutevol[] = { "pamixer", "-t",              NULL };