Lost MIDI messages
Lost MIDI messages
- Subject: Lost MIDI messages
- From: Todd Blanchard <email@hidden>
- Date: Thu, 24 Apr 2008 13:29:52 -0700
I have a user who is testing my application and he reports that
program change messages are only getting through about half to one
third of the time. These are messages I'm writing to an external MIDI
interface to control a Roland RD300SX.
The RD300SX has kind of an odd protocol for patch changing - you send
it a MIDI Control 0 value 87, a MIDI Control 32 value 67-ish to select
the right bank, and then a MIDI Program Change with some value.
I've instrumented my code and print out the messages I'm about to send
and again immediately after. No exceptions are thrown and I see no
errors. All messages are sent.
However, using MIDI Monitor to spy on sent messages, they only make it
out about 1/2 to 1/3 of the time on his machine.
On my machine, MIDI Monitor faithfully reports all messages I send -
no droppage at all. (My user is halfway around the world so I'm
relying on what he tells me).
His OS is 10.4.11 - I'm using 10.4.9. Not that I think it matters.
Can I buy a clue what would cause message loss like that? Wonky MIDI
driver for his device? His setup
MacBook 2ghz w/ 2GB of ram
OSX 10.4.11
Presonus Firepod (Audio use only)
Unitor AMT 8 MIDI interface (MIDI only)
I think the Unitor is an older device but I don't know much about it.
I'm stumped.
-Todd Blanchard
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