Minecraft – How to make custom sounds resource packs

Yes, you are able to play custom sounds with Command Blocks using command:

playsound <sound> <player> [x] [y] [z] [Volume] [Pitch] [minimumVolume]

Minecraft Wiki has the following description:

Example: Sound located at .minecraft\assets\sound\mob\pig\death.ogg The value for sound would be written as mob.pig.death, as the command originates from the sound folder. For sequentially numbered files pertaining to the same event (like various walking sounds), the player must exclude the number of the sound (for example, sound located at .minecraft\assets\sound\mob\pig\say2.ogg). In this case, the command will play a randomly selected sound out of the three available. A player or area must be selected, and the player must be able to hear the sound from where it is played.

I have no knowledge on adding more numbered sounds, but the wording of the above description makes me think it should be handled OK by the game. Unless anyone else adds that information, you'll have to test yourself - just add a loud scream to zombie groans and walk around for some time :)

You cannot directly set someone's hunger. You can however give people hunger or saturation status effects to manipulate their hunger levels.

To give everyone on blue team Hunger II for 10 seconds:

/effect @a[team=blue] hunger 10 1

To give everyone on red team Saturation V for 20 seconds:

/effect @a[team=red] saturation 400 4

Note that the effect potency (last argument) is one less than what it shows as, and the duration (second to last argument) is in seconds on hunger, but ticks on saturation (blame Mojang).

If you want to make sure someone is at a certain level of hunger, you'll need to periodically:

1. Give them really potent hunger, making everyone have 0 hunger points
2. Give them just enough saturation to get them up to the hunger level you want

It's a bit of a workaround to the fact that /entitydata doesn't work on players.