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Tools for exploring the Zoom MS Plus series effect pedals

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zoom-explorer

Zoom Explorer is a web-based for exploring the Zoom MS Plus series effect pedals, and this Readme contains my findings regarding MIDI-communication with these pedals.

The Zoom Explorer webpage is here: www.waveformer.net/zoom-explorer.

The user-friendly patch manager for the Zoom MS+ pedals is here: sym.bios.is

All numeric values listed below are in hexadecimal.

Device IDs

  • 6E = Zoom MS-50G+

To get the device ID and OS version, send a MIDI Identity Request message

F0 7E 7F 06 01 F7

Responses:

MS-50G+: F0 7E 00 06 02 52 6E 00 23 00 31 2E 31 30 F7

  • Manufacturer ID: 52 (Zoom)
  • Family code: 6E 00 (MS-50G+)
  • Model number: 23 00
  • Version number 31 2E 31 30 (System 1.10, Preset 1.00, Boot 1.00, Checksum EE8E)

Commands / message types

For the short 6 byte messages, the message type or command is just one byte and the format is the same as for the original MS series pedals:

F0 52 00 <device ID> <message type> F7

For the longer message types, the message type is two bytes.

F0 52 00 <device ID> <message type byte 1> <message type byte 2> <rest of message> F7
Message type Length Send Receive Message Description
00 00 7 * F0 52 00 6E 00 00 F7 Acknowledge / Success
00 01 7 * F0 52 00 6E 00 01 F7 I heard you, but I don't know what you're trying to tell me.
00 0A 7 * F0 52 00 6E 00 0A F7 Error. Perhaps you asked for a non-existing bank/program?
01 6 * F0 52 00 6E 01 F7 Initiate firmware mode. WARNING: Don't do this if you don't know what you're doing!
04 6 * F0 52 00 6E 04 F7 Exit firmware mode. The display will show "Completed!". Restart pedal to return to normal mode.
05 6 * F0 52 00 6E 05 F7 Perhaps this means "Hi"? The response is always 00 00 (success). Seems harmless enough, anyway.
06 10 * F0 52 00 6E 06 F7 Total number of patches and patch length
07 6 * F0 52 00 6E 07 F7 Get total number of patches and patch length (reply with message type 06)
08 986 * F0 52 00 6E 08 00 00 <patch number> <length LSB> <length MSB> <patch> 00 <5 byte CRC> F7 Patch dump, after message type 09 is sent to the pedal. Length is for unpacked 8-bit patch data. Some pedals / OS versions might not have the CRC at the end?
09 9 * F0 52 00 6E 09 00 00 <patch number> F7 Download patch from given patch slot (reply with message 08)
33 6 * F0 52 00 6E 33 F7 Get current bank and program number. Replies with optional bank change messages and a program change message.
43 30 * F0 52 00 6E 43 F7 Bank/patch info. Response to message 44. Probably a more updated version of message 06 for newer pedals.
44 6 * F0 52 00 6E 44 F7 Get bank/patch info.
45 00 00 989 * * F0 52 00 6E 45 00 00 <bank LSB> <bank MSB> <\program LSB> <program MSB> <length LSB> <length MSB> <patch data> <5 byte CRC> F7 Patch dump, automatically sent a few seconds after user changes a parameter, or after message type 46 00 is sent to the pedal. Perhaps this is sent only if auto save is enabled on pedal.
46 00 12 * F0 52 00 6E 46 00 00 <bank LSB> <bank MSB> <\program LSB> <program MSB> F7 Download patch from given bank/program slot
50 6 * F0 52 00 6E 50 F7 Parameter edit enable
51 6 * F0 52 00 6E 51 F7 Parameter edit disable
52 6 * F0 52 00 6E 52 F7 PC mode on
53 6 * F0 52 00 6E 53 F7 PC mode off
60 XX 7 * * F0 52 00 6E 60 00 F7 API for accessing files. Show caution!
60 05 00 8 * F0 52 00 6E 60 05 00 F7 Flush buffer / clean data (needs more testing)
64 01 ? * F0 52 00 6E 64 01 <rest of message> F7 Display information. Response to message 64 02
64 02 10 * F0 52 00 6E 64 02 <start screen> <end screen> 00 F7 Get display information. The last byte can be 00 or 01. 00 gives a longer reply than 01 (ommiting some parameter names)
64 0B 7 * * F0 52 00 6E 64 0B F7 Tuner on
64 0C 7 * * F0 52 00 6E 64 0C F7 Tuner off
64 12 985 * F0 52 00 6E 64 12 01 <length LSB> <length MSB> <patch data> <5 byte CRC> F7 Patch dump (curren patch), automatically sent after user changes effect for a slot, or after message type 64 13 is sent to the pedal
64 13 7 * F0 52 00 6E 64 13 F7 Get current patch (replies with 64 12)
64 20 00 15 * * F0 52 00 6E 64 20 00 <effect slot> <param number> <LSB> <MSB> 00 00 00 F7 Update (edit) parameter
64 20 00 5F 15 ? * F0 52 00 6E 64 20 00 5F <character index> <ASCII character> 00 00 00 00 F7 Name edited (backspace)
64 20 00 64 01 15 * * F0 52 00 6E 64 20 00 64 01 <selected effect slot number> 00 00 00 00 F7 Select effect slot number on pedal
64 20 00 64 02 15 * * F0 52 00 6E 64 20 00 64 02 <LSB> <MSB> 00 00 00 F7 Set/get tempo (BPM)
64 20 01 15 * F0 52 00 6E 64 20 01 <effect slot> <param number> <LSB> <MSB> 00 00 00 F7 Acknowledge that parameter has been updated. Response to 64 20 00 if the parameter was accepted (in range).
64 13 7 * F0 52 00 6E 64 13 F7 Get current patch from edit buffer (expects a reply with message type 64 12)
64 26 13 * F0 52 00 6E 64 26 00 00 <bank LSB> <bank MSB> <\program LSB> <program MSB> F7 Bank and program number
64 42 7 * F0 52 00 6E 64 42 F7 Unknown. See mungewell/zoom-zt2#70
64 43 ? * F0 52 00 6E 64 42 F7 Reply to 64 42. Unknown.
64 47 7 * F0 52 00 6E 64 47 F7 Create new bank (delete current bank). The pedal responds with misc messages, see mungewell/zoom-zt2#70

Screens (message type 64 01)

If one of the effects is the BPM module, the screen for that module will be missing.

Parameter editing

When the users edits the name of the patch, the pedal sends out parameter updates for each letter in the name, typically a burst of "64 20 00 5F" messages.

Inbetween that the pedal sends a burst of "C0 00" messages (program change ???). This could be a bug in the pedal firmware.

This has been observed before, here: mungewell/zoom-zt2#70

Needs investigating

  • What are the device IDs for other MS Plus Series pedals?

Calls and response

Some careless experimentation for 6 byte messages. It's not recommended to experiment blindly with longer messages, or you will brick your pedal.

F0 52 00 6E 01 F7 -> F0 52 00 6E 00 0B F7        # Enters firmware update mode
F0 52 00 6E 03 F7 -> F0 52 00 6E 00 01 F7
F0 52 00 6E 04 F7 -> F0 52 00 6E 00 00 F7        # Exits firmware update mode
F0 52 00 6E 05 F7 -> F0 52 00 6E 00 00 F7
F0 52 00 6E 07 F7 -> F0 52 00 6E 06 64 00 50 06 F7
F0 52 00 6E 09 F7 -> F0 52 00 6E 00 01 F7
F0 52 00 6E 12 F7 -> F0 52 00 6E 00 00 F7
F0 52 00 6E 28 F7 -> F0 52 00 6E 00 01 F7
F0 52 00 6E 33 F7 -> B0 00 00, B0 20 02, C0 06   # Set/Get current bank and patch number
F0 52 00 6E 44 F7 -> F0 52 00 6E 43 64 00 50 06 64 00 0A 00 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 F7
F0 52 00 6E 45 F7 -> F0 52 00 6E 00 01 F7
F0 52 00 6E 46 F7 -> F0 52 00 6E 00 01 F7
F0 52 00 6E 48 F7 -> F0 52 00 6E 47 02 00 00 00 00 00 00 10 00 00 00 00 00 00 00 06 F7
F0 52 00 6E 50 F7 -> F0 52 00 6E 00 00 F7        # Parameter edit enable
F0 52 00 6E 51 F7 -> F0 52 00 6E 00 00 F7        # Parameter edit disable
F0 52 00 6E 52 F7 -> F0 52 00 6E 00 00 F7        # PC mode on
F0 52 00 6E 53 F7 -> F0 52 00 6E 00 00 F7        # PC mode off
F0 52 00 6E 55 F7 -> F0 52 00 6E 54 00 01 00 00 00 01 00 00 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 02 F7
F0 52 00 6E 56 F7 -> F0 52 00 6E 00 0D F7
F0 52 00 6E 57 F7 -> F0 52 00 6E 00 00 F7
F0 52 00 6E 5B F7 -> F0 52 00 6E 00 00 F7        # Factory reset. WARNING: Wipes all user patches!

F0 52 00 6e 44 00 00 00 00 F7 -> F0 52 00 6E 43 64 00 50 06 64 00 0A 00 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 F7
F0 52 00 6e 48 00 00 00 00 F7 -> F0 52 00 6E 47 02 00 00 00 00 00 00 10 00 00 00 00 00 00 00 06 F7 
F0 52 00 6e 55 00 00 00 00 F7 -> F0 52 00 6E 54 00 01 00 00 00 01 00 00 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 02 F7
F0 52 00 6e 64 0a 00 00 00 F7 -> F0 52 00 6E 64 09 78 00 00 00 0A 00 00 01 00 32 0F 00 07 00 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 32 32 32 64 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 F7
F0 52 00 6e 64 11 F7 -> F0 52 00 6E 64 10 0E 02 04 01 00 F7 
F0 52 00 6e 64 18 00 00 64 00 F7 -> F0 52 00 6E 64 19 01 00 00 09 00 0A 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 F7

MS-50G (Original pedal) commands

Message type Length Send Receive Message Description
00 7 * F0 52 00 58 00 00 F7 Acknowledge / Success
01 6 * F0 52 00 58 01 F7 Unknown. Reply is F0 52 00 58 00 0B F7
04 6 * F0 52 00 58 04 F7 Unknown. Reply is F0 52 00 58 01 00 F7
05 6 * F0 52 00 58 05 F7 Unknown. Reply is F0 52 00 58 00 00 F7
06 10 * F0 52 00 58 06 <num patches LSB> <num patches MSB> <patch length LSB> <patch length MSB> F7 Total number of patches and patch length
07 6 * F0 52 00 58 07 F7 Get total number of patches and patch length (reply with message type 06)
08 156 * * F0 52 00 58 08 00 00 <patch number> <length LSB> <length MSB> <patch> 00 <5 byte CRC> F7 Patch dump, after message type 09 is sent to the pedal. Length is for unpacked 8-bit patch data. Some pedals / OS versions might not have the CRC at the end?
09 9 * F0 52 00 58 09 00 00 <patch number> F7 Download patch from given patch slot (reply with message 08)
0B 7 * F0 52 00 58 00 0B F7 Unknown reply to command 0E
0E 6 * F0 52 00 58 0E F7 Unknown. Reply is F0 52 00 58 00 0B F7
16 6 * F0 52 00 58 16 F7 Unknown. Reply is F0 52 00 58 17 45 00 00 00 00 F7
17 11 * F0 52 00 58 17 45 00 00 00 00 F7 Unknown. Reply to command 16
28 146 * * F0 52 00 58 28 <patch> F7 Patch dump, after message type 29 is sent to the pedal
29 6 * F0 52 00 58 29 F7 Download current patch from edit buffer (reply with message type 28)
31 10 * * F0 52 00 58 31 <effect slot> <param number> <LSB> <MSB> F7 Update (edit) parameter
31 03 08 10 * * F0 52 00 58 31 03 08 <LSB> <MSB> F7 Update (edit) tempo. Clashes with param 8 for effect slot 3.
32 15 * * F0 52 00 58 32 01 00 00 <patch number> 00 00 00 00 00 F7 Store current (non-saved) edit patch into the given patch number. This message is also emitted when a patch has been saved on the pedal.
33 6 * F0 52 00 58 33 F7 Get current bank and patch number
50 6 * F0 52 00 58 50 F7 Parameter edit enable
51 6 * F0 52 00 58 51 F7 Parameter edit disable
60 6 * F0 52 00 58 60 F7 Unknown. Flush data? Reply is F0 52 00 58 60 05 00 F7

Useful links

Acknowledgements

A huge thank you to all those who have previously worked on figuring out the MIDI protocol for the Zoom pedals and shared their work with the world.

A special thanks to these guys who have answered my questions and guided me along the way:

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