Slurs going both directions

[Daniel Ashton]

Is this possible?  The music I'm typesetting has a voice going from the 
right-hand staff to the left-hand staff.  (I'm using the \translator 
function.)  Four quarter-notes are slurred together, the first two on 
the upper staff with stems down, the second two on the lower staff with 
stems up.  The slur should be between the staves.  It should have it's 
left end tilted up, and its right end tilted down.  Is this possible?

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Daniel Ashton      PGP key available     http://Daniel.AshtonFam.org
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