Millisecond Forums

Hi,

I want to present 10 randomly selected sounds to each respondent from a list of 30 sounds and each participant rates it on a Likert scale. And the list element then presents the same 10 sounds to each respondent in subsequent blocks too.
Problem that I am facing is that instead of 10 different random sounds presented to each respondent, I find that same list of 10 sounds is presented to all respondents. There is no variation / randomness in that. 
What is wrong in this code? How can I ensure that 10 different random sounds out of 30 is presented to each respondent rather than the same list of sounds presented to each.

Thanks

<sound 1S>
/ items = 1S
/ playthrough = false
/ select = values.1S
</sound>

<item 1S>
/1="1.wav"
/2="2.wav"
/3="3.wav"
/4="4.wav"
/5="5.wav"
/6="6.wav"
/7="7.wav"
/8="8.wav"
/9="9.wav"
/10="10.wav"
/11="11.wav"
/12="12.wav"
/13="13.wav"
/14="14.wav"
/15="15.wav"
/16="16.wav"
/17="17.wav"
/18="18.wav"
/19="19.wav"
/20="20.wav"
/21="21.wav"
/22="22.wav"
/23="23.wav"
/24="24.wav"
/25="25.wav"
/26="26.wav"
/27="27.wav"
/28="28.wav"
</item>


<list 1Snumbers>
/ poolsize = 10
/ items = [sound.1S]
</list>


<values>
/ 1S = 1
</values>


<likert NewStudy1>
/ ontrialbegin = [values.1S = list.1Snumbers.nextindex]     
/ anchors = [1="Rating1"; 11=" Rating2"]
/ stimulusframes = [1 = list.1Snumbers; 100= list.1Snumbers;           200= list.1Snumbers;       300= list.1Snumbers;  400= list.1Snumbers;       500= list.1Snumbers;       600= list.1Snumbers;       700= list.1Snumbers;  800= list.1Snumbers;       900= list.1Snumbers;       1000= list.1Snumbers;     1100= list.1Snumbers;  1200= list.1Snumbers;     1300= list.1Snumbers;     1400= list.1Snumbers;     1500= list.1Snumbers;  1600= list.1Snumbers;     1700= list.1Snumbers;     1800= list.1Snumbers;     1900= list.1Snumbers;  2000= list.1Snumbers;     2100= list.1Snumbers;     2200= list.1Snumbers;     2300= list.1Snumbers;  2400= list.1Snumbers;     2500= list.1Snumbers;     2600= list.1Snumbers;     2700= list.1Snumbers;  2800= list.1Snumbers;     2900= list.1Snumbers;     3000= list.1Snumbers;     3100= list.1Snumbers;  3200= list.1Snumbers;     3300= list.1Snumbers;     3400= list.1Snumbers;     3500= list.1Snumbers;  3600= list.1Snumbers;     3700= list.1Snumbers;     3800= list.1Snumbers;     3900= list.1Snumbers;  4000= list.1Snumbers;     4100= list.1Snumbers;     4200= list.1Snumbers;     4300= list.1Snumbers;  4400= list.1Snumbers;     4500= list.1Snumbers;     4600= list.1Snumbers;     4700= list.1Snumbers;  4800= list.1Snumbers;     4900= list.1Snumbers;     5000= list.1Snumbers;     5100= list.1Snumbers;  5200= list.1Snumbers;     5300= list.1Snumbers;     5400= list.1Snumbers;     5500= list.1Snumbers;  5600= list.1Snumbers;     5700= list.1Snumbers;     5800= list.1Snumbers;     5900= list.1Snumbers;  6000= list.1Snumbers;     6100= list.1Snumbers;     6200= list.1Snumbers;     6300= list.1Snumbers;  6400= list.1Snumbers;     6500= list.1Snumbers;
]
/ fontstyle = ("Arial", 1.4%,true, false, false, false, 5, 0)
/ beginresponseframe = 1
/ anchorwidth = 150
/ recorddata = true
/ response = free
/ numpoints=11
/ position = (50, 55)
</likert>