Millisecond Forums

Hi Dave,
I'm trying to have a pre-generated sequence of orientations for the images, so that each trial, there's varying rotation value.
I know how the pre-generated sequence works for images, but I can't figure out how to work this out for the orientation. Here is my toy script that I tried with list attributes so that orientation for each trial becomes 30, 45, and 90.

<item images>
/1 = "stimuli/yellow_line.png"
/2 = "stimuli/red_line.png"
/3 = "stimuli/blue_line.png"
</item>

<picture inst_base>
/ items = items.images
/ size = (15%, 30%)
/ position = (50%, 50%)
/ rotation = values.ang
</picture>
    
<text InstTitle>
/ items = ("ORIENTATION JUDGEMENT TASK")
/ fontstyle = ("Arial", 3.5%, true, false, false, false, 5, 1)
/ position = (50%, 10%)
</text>

<text Inst1>
/ items = ("In this study, you will see a line (BASE IMAGE) and a picture with striples (TARGET IMAGE).")
/ fontstyle = ("Arial", 3%, false, false, false, false, 5, 1)
/ position = (50%, 20%)
</text>

<list angles>
/ items = (30 45 90)
/ selectionmode = sequence
</list>

<trial tr_instr1>
/ stimulusframes = [1 = Inst1, InstTitle, inst_base]
/ validresponse = (57)
/ beginresponsetime = 500
/ ontrialbegin = [
    values.ang = list.angles.nextvalue
]
</trial>

My question is - if I want to pre-generate the sequence of orientations (for hundreds of trials) and especially multiple pre-generated sequences that will be randomly assigned to each participant, what would be the best way to implement it?
Should my text file include the list? Something like -

<list angles>
/ items = (30 45 90 30 40 20 50 180 ... 300)
/ selectionmode = sequence
</list>

and, randomly call a file for each participant? (I saw a forum post about this, and I think I can work on it on my own).
Or, is there a way to make it an item attribute and use it? 

I'm sorry if something similar has been asked before - I couldn't find this exact solution.

Thank you so much for your help in advance!
Yaelan