Move tie to the end(top) of the stem

[Knute Snortum]

I have a piece I'm typesetting where an internal voice needs a tie, but \tieDown isn't enough.  The tie spanner needs to be at the bottom (in this case) of the stems.  Here is a snippet that illustrates the problem:

\version "2.18.2"

\new Staff {

\key bes \major

\time 5/4

<<

{

<aes aes'>4 <bes bes'> <aes aes'>

<bes bes'>8[ <c' c''> <ees' ees''> <bes bes'>]

} \\

{

\override Stem.length = #8.0

\stemDown ees'2. ees'4 ~ ees'8 r8

}

>>

}

Knute Snortum

(via Gmail)