Okay then eternalsun,

acurasquirrel says that his channel cutout problem was due to the sled not being in properly. It appears he (she?) may have been wrong with their diagnosis. I will see if I can reproduce it. Can anyone else?

The distance is the distance the channel is moved away. So if the speaker is 0.3m away physically a delay of 1.0m will put the speaker 1.3m away acoustically.