> It seems to me that I once heard somewhere, many years ago, that a > person can't hear an echo from any object closer than 30 feet. That I'm not a trained musician* but I discovered just a few days ago that I could clap my hands with my front door open**, and hear the echo off my neighbor's house. And that IS about 30 feet one-way. > second, that means the shortest echo a person can hear is 55 > milliseconds (55,000 microseconds). > > So, it seems to me that the note timing needs to be accurate to about 50 > milliseconds. OTOH, hearing a 50 ms error in the duration of a note is a lot harder than hearing two sounds 50 ms apart in time and 30 feet apart in origin as two sounds. * I used to play keyboards and the rest of the band used to complain about my poor sense of rhythm. But they couldn't find anybody else to do it..... ** Trying to get two grade-schoolers out the door. -- Too late to write in Wes Groleau for President http://freepages.rootsweb.com/~wgroleau