BGSound(xSD,+VOL,+ECH,xKB,TIM)

Plays Background sound as indexed.

SD = Sound ID
(Asterisked entries play on loop)
x01 Rain 1*
x02 Rain 2*
x03 Thunder 1*
x04 Rain Storm 1*
x05 Wind 1*
x06 Young Birds*
x07 Bird*
x08 Birds*
x09 Beast Howling
x0A Rain Storm 2*
x0B Wind 2*
x0C Cadets Training*
x0D Night 1*
x0E Thunder 2*
x0F Night 2?*
x10 Thunder Bolt 1
x11 Thunder Bolt 2
x12 Thunder Bolt 3
x13 Thunder Bolt 4
x14 Thunder Bolt 5
x15 -Blank-
x16 -Blank-
x17 -Blank-
x18 Windmill Part 1*
x19 Windmill Part 2*
x1A Exploding*
x1B Foreign Musical Duo?*

VOL = Volume (signed)
+000 is 0% Volume
+063 is 50% Volume
+127 is 100% Volume

ECH = Echo (signed)

Strength and duration of accompanying echoes.

KB = Keep Background Sounds
-x00: Kill any current playing background sound.
-x01: Plays assigned sound alongside ones currently playing.

TIM = Time needed to reach maximum volume
060: 1.00 Seconds
090: 1.50 Seconds
200: 3.33 Seconds