Path: utzoo!utgpu!water!watmath!clyde!att!ucbvax!OAC.UCLA.EDU!CSYSMAS
From: CSYSMAS@OAC.UCLA.EDU (Michael Stein)
Newsgroups: comp.sys.atari.st
Subject: Midi ports
Message-ID: <8809022134.AA12781@ucbvax.Berkeley.EDU>
Date: 2 Sep 88 00:12:00 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 28

> Date: Thu, 25 Aug 88 10:16:42 EDT
> From: cpc@holmes.lcs.mit.edu
> Subject: Midi ports

>   When the ST receives a note (or, probably, anything) through
>   MIDI IN, it pipes it through to MIDI OUT.  My evidence is
>   that when I hook both cables between the ST and the synth,
>   the synth reports that it is *receiving* info whenever I play
>   a noth on its keyboard.  The sound is slightly different, and
>   the number of voices is cut in half (because every note is
>   being played twice.  This has nothing to do with the Dr.T
>   sequencer, because it happens when I just turn on the ST.

Check your cables.  The MIDI out port on the ST also has MIDI
thru available on some of the pins.  MIDI thru is a copy of the
MIDI "in" signal (unchanged).  It sounds like you are getting
this instead of the MIDI out signals (which can only be data from
the ST).

MIDI OUT port:

 pins 1/3 = midi thru
 pins 4/5 = midi out
 pin  2   = ground (just for shield of cable)

MIDI IN port:

 pins 4/5 = midi in