Best is to get in touch with MRL Calibration Tapes : www.mrltapes.com
You'll find huge documentation about alignment there. Send them a mail and you'll get some advice from them about the right test tape to be used for your own recorder (fluxivity, fringe compensation or not, eq, speed etc). Looks like they sell ATR test tapes too, btw they did in 2008... http://home.comcast.net/~mrltapes/pubpl2008-atr.pdf
For any technical support questions about ATR Master Tape and calibration tapes please feel free to call us directly at 717-718-8008 or email to techinfo@atrtape.com. There are hundreds of MRL tapes and we can recommend and supply the most economical calibration tape to suite your requirements.