IR tramsmitter usage:

Single button ir transmission
ON
OFF
A amplifier select
B amplifier select
V+
V-

Setting volume level is a two or 4 button sequence
LEVEL/0
LEVEL/1
LEVEL/2
LEVEL/3
LEVEL/4
LEVEL/5
LEVEL/6
LEVEL/7
LEVEL/8
LEVEL/9
LEVEL/+10/1/0
LEVEL/+10/1/1

Executing macros are a two or 4 button sequence
MACRO/1
MACRO/2
MACRO/3
MACRO/4
MACRO/5
MACRO/6
MACRO/7
MACRO/8
MACRO/9
MACRO/+10/1/0
MACRO/+10/1/1
etc.

Selecting zone for subsequent ir transmissions are a two or 4 button sequence
ZONE/0 (global OR all)
ZONE/1
ZONE/2
ZONE/3
ZONE/4
ZONE/5
ZONE/6
ZONE/7
ZONE/8
ZONE/9
ZONE/+10/1/0
ZONE/+10/1/1
etc.