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Using $FA $02 $XX to tune down

Hi! I'm using $FA $02 $XX for the first time in a port I'm working on. I'm using it to shift a loop up 2 semitones, and I'm trying to shift back down 2 semitones after. What should I fill in for $XX in this case? I thought I had read somewhere that values above $80 were treated as negative, but $FA $02 $82 didn't change the pitch at all. Here's a snippet from the port:

Code
$FA $02 $02 *
$FA $02 $XX *


where * is my repeating section. Thanks in advance!
Not for this one: Tuning low values start with $FF (which is -1 semitone), and then the lower value you go, the lower the pitch is.
Awesome! Thank you. So, $FE would be down two semitones?
That is correct.
depends on what you need, $FA $02 is an absolute command based around the root pitch of your phrase; ergo, if you want to tune down two steps relative from $FA $02 $02, you'd be resetting it back to $FA $02 $00. but if you want to be two semitones down from root pitch, THEN you'd be using $FA $02 $FE.
Ah thank you, that'll be useful down the road. It seems like both $FE and $00 work in this case for me! Thanks for both of your help.