need sndseq help

i am just learning some zdoom editing and yesterday i built my first polyobj (sliding door) :). But, when i write my sndseq lump, the door doesnt play it right. Instead of playing the open sound when it opens and the close sound when it closes, it just plays both when it opens and both when it closes. What should my sndseq lump script be?

Here is an example:

:Door1
door 0
playuntildone door1_start
playrepeat door1_mid
stopsound door1_end
end