I use ASI4All. Regarding optimizing a Vista pc for BIAB, softsynths, DAWS, and music making in general, some who use Vista (I have Vista on my laptop and XP on my desktop) may find this link helpful: http://www.audioforums.com/windows-vista-optimization.php. Also, this latency checker tool is very usefuL: http://www.thesycon.de/deu/latency_check.shtml. It was mentioned in anarticle in Computer Music.