Originally Posted by MAX PLY
Sounds like you are picking up that used Neos you mentioned in a different thread. You may also find that the Neos manual is helpful. If you are not getting one with the machine, I suspect several of us on this board can provide you with a pdf of one. Congrats and good luck.
I agree it is very helpful. You can download it here: http://img.tennis-warehouse.com/pdfs/NEOSManual.pdf
When should you serve and volley in doubles? Only when you want to win.