I been doing a lot of research on this subject and have learned a great deal, but there are a few details I need some answers on. From what I have read, you can have a wrong length of closed end tube, and you will need to tune it by means of a sliding collar, stopper, or coning the mouth. So, if you can cut one the wrong length, then obviously you can cut one the correct length as well. If cutting to a correct length, do you still need an end correction, or is this what you are taking into account when cutting? On a resonance tube, for a certain frequency to cause it resonate at a certain volume of air, at a certain temperature, if this the true center of the anti-node? Do you want the anti-node at the mouth? Thanks.