Actually I just finished using IR-trans to accomplish this for my car. I have a Convertable, so I needed to switch from Top-Down (open) to top-up EQ settings. Here's the config.ini code I used. WIth a little modification I'm sure you could work something cool out for your application. HTH. I used the Tuner button on the Rio remote & since I don't have a tuner, it seemed like a good button to give up.

[ir_translate]
; select OPEN eq (#2)
20df07.S=20DF0F.L,20DF01,20DF0C.S
; select CLOSED eq (#3)
20df07=20DF0F.L,20DF02,20DF0C.S
[hijack]
button_pacing=10