Set sample position to sample position

I have two pieces of music playing, they are the same melody, just with different instruments so they should sync. I am calling the two pices to play at different times, when I start the 2nd one, I add an action just after it that sets the position of it, to the position of the 1st sample (or I've set position of channel 2 to channel 1)

Both methods fail. It just starts the 2nd sample from the beginning, as if I've not told it to copy the position of the 1st one. How do these actions work?

Okay I solved it pretty quickly. I'm not sure if I was misunderstanding something about my above method, but it doesn't seem to work.

The solution was to always set a value to channel 1's position, then get channel 2 to start from that value, rather than referencing the channel/sample directly. It doesn't seem like it can check the position of the sample and/or channel, despite the option being there..?