Python SOP get channel data CHOP

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Hi all!
Im completely stuck writing my second Python SOP. What I want to do is in my py sop get data from a specific chops channel that the user specifies with an absolut path. I want to be able to sample the chops channel on different frames (current, previous and next).
If someone could point me in the right direction, maybe with a line of code for how to point to this chop node, that would be much appreciated!
I've been trying with hou.ChopNode and hou.Track but couldn't figure out how to init / set it up.
My chop network is really simple, starts with a file, followed by a filter and a trigger and ends with a null containing one channel, amplitude.
Thanks for your time
/John
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