The MS-40 MIDI Snoop is a full-featured MIDI Command analyzer built into a pocket-sized case. It features two interchangeable MIDI connectors, either one of which can be used as MIDI IN or MIDI THRU. The MS-40 utilizes 40 LEDs to indicate the type of MIDI Message on the line, and is able to recognize all Channel Voice (including Running Status), System Common, System Real Time and System Exclusive messages, as well as MIDI Show Control and MIDI Machine Control Sysex messages. Two different types of errors are indicated. The unit automatically shuts itself off after a period of inactivity to conserve battery power. You no longer need a full MIDI Command analyzer/ dedicated computer with a MIDI interface to test your MIDI system!
Set Up and Power
Slide the battery compartment open and insert two AA batteries, observing the polarity indicators. Under normal conditions your batteries should last for approximately 1000 hours of use. Press the red Power button to activate the MS-40. The Power indicator will blink to indicate the unit is functioning. The unit will automatically shut itself off after a 5 minute period of inactivity. This time can be adjusted by the user, if necessary.
Connection
The MS-40 has two female MIDI connectors, and either one can be used as MIDI IN or MIDI THRU. The MS-40 does not constitute a MIDI load so it may be connected anywhere in the system.
MIDI Messages and Errors
The MS-40 recognizes the syntax of all Channel Voice, (including Running Status), System Common and System Real Time messages, as well as System Exclusive, MIDI Show Control and MIDI Machine Control. It responds to these messages by lighting the appropriate LED(s) for a half-second.
When the MS-40 receives a MIDI message with incorrect syntax it will light both the ERROR LED and the message LED for twice as long as normal. This allows the operator to determine which message caused the error. Some examples of incorrect syntax would be a Status byte without a Data byte or an End