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From: Henry_Burdett_Messenger@cup.portal.com
Newsgroups: comp.sys.atari.st
Subject: Re: MIDI-Controllers
Message-ID: <712@cup.portal.com>
Date: Tue, 15-Sep-87 22:33:34 EDT
Article-I.D.: cup.712
Posted: Tue Sep 15 22:33:34 1987
Date-Received: Fri, 18-Sep-87 06:26:11 EDT
References: <2259056@um.cc.umich.edu>
Organization: The Portal System (TM)
Lines: 42
XPortal-User-Id: 1.1001.1746



   There is a longword at hex 4ba (hz_200) which contains a clock value
   accurate to 5 ms. This more than adequate for MIDI, since a note-off
   message for even a three-finger chord requires 4 ms...

       32000 bps = approx 3200 bytes/sec

       One note-off message is 3 bytes, and therefore requires 1 ms to
       be sent down the wire.

       v--- 5 ms ----v
       [1][2][3][4]

       1 = note off msg #1, 2 = note off msg #2, 3 = note off msg #3
       4 = all notes off

       Since this is supposed to be happening "simultaneously", a one
       ms clock isn't required.
  
   My MIDI sequencer works perfectly well with a 5 ms clock... 
  
 -------------------------------------------------------------------------- 
        A member of the David Van Tieghem underground fan club :-) 
    Henry B. Messenger, a DECperson, but in no way representing Digital. 
    USENET: henry_burdett_messenger@cup.portal.com   CIS: 72477,3356