refined code for the ttlEcho function added previously to v2006.2.13 (see above). The function seems more stable now.
[the following is from the support email of a ttlEcho function tester as of v2006.2.18]
I tested it this morning and it appears to work. Yay! Thank you so much for this; you've saved me countless hour of heartache by not having to use the totally crappy presentation software packaged with my EEG system. THANK YOU! I even checked the timing and everything looks accurate up to the millisecond!