How can I update the MIDI software for my JP-2C?
To perform a software update for your JP-2C, you’ll require a firmware update file (see attachment below), a computer, a Midi/USB Interface, and a Midi app/utility capable of sending and receiving Midi SysEx files (the two free ones that we recommend are SysEx Librarian by www.snoize.com for Mac users and Midi-OX via www.Midiox.com for Windows). At this time, all JP-2Cs have shipped with the current Midi software but should an update become available, it will be posted as an attachment to this article.
Software updates should be performed with the amp in STANDBY, and the Midi THRU/OUT and MESA FT.SW. jacks left unconnected.
IMPORTANT!!! Midi app/utility settings are below for Software updates:
Mac - SysEx Librarian
Menu > Preferences
Transmit Speed = 50% max.
Windows - Midi-OX
Main Menu > View > SysEx
SysEx Window Menu > SysEx > Configure
Low Level Output Buffers, Size = 256 & Num = 64
Output Timing & Delay Between Buffers = 192ms min.
Auto-Adjust Buffer Delays If Necessary = Off/Unchecked
As with any piece of modern gear, it’s always a very good idea to BACKUP YOUR PRESETS BEFORE PERFORMING A SOFTWARE UPDATE!
To perform a Software update, the amp MUST be powered-up with the STORE SWITCH engaged AND the CHANNEL SWITCH set to CH#1. The STORE LED will remain on, indicating the software update mode.
Changing the amp’s Channel prior to sending the firmware update file will abort the Software update process, the STORE LED will turn off, and the amplifier will return to its normal mode of operation.
Upon receiving a firmware update file, the STORE LED will begin to blink steadily and will continue to blink during the update. Software updates will take about 30 seconds to complete.
After performing a successful software update, the STORE LED will stop blinking, and the amplifier will return to its normal mode of operation.
If a software update fails, the STORE LED will remain illuminated until the amp begins receiving a firmware update file again. Any failures could only be due to either a corrupted file or because the file is being sent to the amp faster than it can be processed. Midi app/utility settings have been provided (above) which will prevent the firmware update file from being sent to the amp faster than it can be processed, avoiding any speed related failures.
If, after a failed software attempt due to a speed related failure, the STORE LED does not blink when another firmware file has been sent, simply turn off the amp, then power-up again with the STORE SWITCH engaged and the CHANNEL SWITCH set to CH#1 (as before).
The SysEx Librarian app/utility includes two different methods of calculating the checksum of a file. You should check one or both of these against the checksums we’ve published to ensure your file has not been corrupted.
Unfortunately, Midi-OX does not provide a checksum feature, but Microsoft does offer a free utility called “Microsoft File Checksum Integrity Verifier”.
SOFTWARE VERSION SysEx MESSAGE
A short Midi SysEx message will follow every User Preset Dump, as a simple means of ID’ing the amp’s Midi interface software version. To view this message, you’ll need a computer, a Midi/USB Interface, and a Midi app/utility capable of sending and receiving multiple Midi SysEx messages in succession (the two free ones that we recommend are SysEx Librarian by www.snoize.com for Mac users and Midi-OX via www.Midiox.com for Windows users).
JP-2C Owner's Manual
Click here to view a PDF of the JP-2C owner’s manual - containing additional information about its Midi features.
JP-2C MIDI Implementation Chart
MIDI savvy users may also find the MIDI Implementation Chart (shared as a PDF below) a handy, quick reference to the MIDI commands accepted by the JP-2C.
JP-2C Firmware Files
At this time, all JP-2Cs have shipped with the current Midi software but should an update become available, it will be posted as an attachment here.