Battle and boss songs randomizer 
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author: madsiur
version: 1.1
date: 2016/04/28
Apply to FF3us 1.0

Files
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randomsongsC2.asm: For implementation in bank $C2
randomsongsEE.asm: For implementation in bank $EE (or the bank of your choice)

Apply with xkas 0.06
Command example: xkas randomsongsEE.asm romname.smc

Space used
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randomsongsC2.asm: 64 bytes in bank $C2
randomsongsEE.asm: 76 bytes in bank $EE (or the bank of your choice)

Bank $C2 and $EE implementations use by default respectively C2/6469 and $EE/AF01
as free space. Change the org offset (line 25) in the ASM file to move the code.

Description 
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Randomize the battle theme and default boss song. By default the max
number of song for the battle theme is 8 and 4 for the boss theme. 

By default, battleTable and bossTable have their entries nullified
with only the default song as entry. Replace the !noSong in a table 
to add a song choice. You can also reduce or expand the tables. If
your table has 50% or more of null values (!nosong) it is more efficient
to reduce it in half (e.g. remove 4 lines for a 8 song table) than 
nullifying most of the entries. You'll also need to change the !numSongBattle
and/or !numSongBoss value(s).

What the code does is if he picks a null value it will choose a new 
random number and repick from the table. If tables are modified 
properly, the repick probability will always be less than 50%, 
e.g. 44% maximum for a 16 songs table. The probability of a total 
of 3 picks before getting a song is 19% maximum and for 4 picks 
or more is 8,5%. So basically there can be relooping and cycles wasted 
but I don't consider it significant taking in account it was the easiest 
solution code-wise.

To recap, if you want 12 possible songs for the battle theme, add 8
lines to the table and nullifie 4 entries (!noSong). Then you need to 
change the !numSongBattle variable to $0F.

If you got any question, you can send me a email at themadsiur@gmail.com.