I've just posted my version of tabwrite~ (with index into the array for recording start and end points) to our ftp server here at Glasgow, if anyone wants to use it.
Get to it via the links on my site below, or straight to ftp://ftp.music.gla.ac.uk/pub/Pd
Dr Nick Fells, Music Department, University of Glasgow, Tel: +44 (0) 141-330 4096/6065 Glasgow G12 8QQ Fax: +44 (0) 141-330 3518 UK. http://www.music.gla.ac.uk/~nick