Usability Views Article Details  home | timeline | recent | popular | e-reports | userati | about this site Remote Piano Lessons, in Real Time (11 Mar 2004) The systems are not yet perfect, though. It can take up to 400 milliseconds, or almost half a second, for a note that Lucas plays to reach the ear of his instructor. While that delay is not enough to disrupt a conversation, it would be noticeable if two musicians were to play a duet. The notes simply would not match. "Some musicians might say a one-millisecond delay is critical," Mr. Woszczyk said. Article URL: http://www.nytimes.com/2004/03/11/technology/circuits/11pian.html?ex=1394341200&en=dee06a3b8f663c4e&ei=5007&partner=USERLAND Read 20 more articles from New York Times sorted by date, popularity, or title. Next Article: Tomorrow's Soldier Today This site is a labour of love built by Chris McEvoy