"J.B. Wood" wrote in message ...

For those who use MIDI-capable musical instruments: I've got a nearly
25-year old MD 80 MIDI expander (thru) box that works fine but I've
noticed that connecting the MIDI out from some devices to an input on
the MD 80 doesn't always result in a signal at any of the MD 80's 4
output (thru) ports as there should be. Yet connecting a different MIDI
device the same way works. I'm a bit puzzled as to this incompatibility
given the relative simplicity of a MIDI connection. Your comment and
time is greatly appreciated. Sincerely,
--
J. B. Wood e-mail:






Perhaps the MD80 doesn't like MIDI active sensing?

A device with active sensing will send sense data every 250 mSec I think.
Anyway you can find out which devices do and don't do this by inserting an
LED into the two pins either side of centre of the MIDI out socket, and see
if it flashes regularly.
(The LED has to be connected the right way round)




Gareth.