My recently-acquired Python changer (4586) doesn't want to give a tape
back.  I was fooling around with chio, and I think I managed to confuse
the drive somehow.  I know there is a trick for the regular python,
holding down eject at power-on.  The changers don't have eject though,
at least that I can see.  I tried Open/Close and Step, but neither
seemed to do anything. 

Since I know there are a couple users of this drive on the list, if you
know anything about this problem, please email me. Thanks.