Controlled speedline

Same thing, we just anchor to a port o wrap and let the pieces fly on down the line. They’ll stop when the hit the ground, and the portowrap makes it easy to adjust the tension in the line, or move the end that’s attached in the tree.
 
Static line anchored to some way to adjust tension. Second line(your lowering line) through a block placed appropriately in canopy then tied to piece being rigged. Running end of that line goes through port a wrap. Clip piece being rigged onto static line. Wraps to be determined by size of piece being rigged. Hopefully that makes sense.
 
It depends on how much tension is needed.
Port a wrap on or near the chipper is pretty common.
When lots of ground needs to be covered or the tree is downhill I like a mechanical advantage setup with fixed points for the pulleys. If you do it inline like a traditional 3:1 you have to adjust the length constantly as you gain or sometimes give slack. Fixed points the groundsman only needs to pull the slack out as you work up the tree and gain rope.
 
For larger pieces (and neg rigging) what makes sense to me is to have the speeline anchored out to drop zone via a grcs and the rigging/ lowering line just anchored to a porty at the base of the working tree. The piece is attached to both, lowering line and speed line but the speed line is left slack to start. Lowering line is tensioned and piece is dropped onto the lowering line letting a run a little just before holding it still. Then the speedline is tensioned via the grcs and once the angle is correct, the piece is lowered along the speedline.

Dropping big pieces onto a tensioned speedline is never a good idea imo
 
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