Abstract: Rack mountable, user-programmable electronic modules are disclosed that may be used separately, or combined into an integrated system, to analyze, display, troubleshoot, or perform signal conversion on contents or a Musical Instrument Data Interface (MIDI) data stream. Signal conversion capabilities include conversion from a standard MIDI unbalanced current-driven signal format to other electronic forms, such as a balanced differential voltage format, or optical fiber or wireless media formats, that are more suitable for longer distance transmission, and include conversion from a format suitable for long distance back to a standard MIDI format.