Actually, that is really part of the original changes.
The original chord changes for the first six bars are:
G | G#dim7 | Am | A#dim |
G/B | C
Thus creating the chromatic bass line G-G#-A-A#-B-C .
The A#dim chord also a F#7b9 chord (without the root).
Putting a ii in front of this chord is where that sub comes from.
I.e. C#m7b5 F#7 . A#dim is also very close to C#m7b5 so that
is another part of why this sub works.
See my port in the editted digests for "I Remember You", the begginning
of which typically uses a similar rehamonization idea.
reed
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Reed Kotler
reed@justjazz.com
http://www.justjazz.com