There are two gzip'ed files up now of analog digitized 9 track data under http://bitsavers.org/projects/9track containing two files of 16 bit incrementing data patterns blocked 512 bytes/blk and the tach signal from a Qualstar 1260 running at 50 ips. The data can be viewed using Salea's Logic app in simulation mode if anyone has burning curiosity what a 1/2" tape block looks like. I made these as test data today for Len Shustek's 9 track readtape project https://github.com/LenShustek/readtape