Store configuration in EEPROM and implement a sysx interface to edit it

.gitignore

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 *.hex
 *.bak
+*.csv
+*.tsv
+*.xml
+fp-info-cache

README.md

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 # MIDI Drawbars Commander
 
-## Notes:
-You should use a Normally Open pedal to switch from the Leslie's speed, otherwise the "switch impulse" is sent on pedal release instead of pedal push (see issue #24)
+## Pedals:
+### Expression pedal
+Any "standard" expression pedal compatible with the Roland EV5 will do.
+
+### Switch pedal (leslie speed)
+You should use a Normally Open non latching (momentary) pedal to toggle the Leslie's speed, otherwise the "switch impulse" is sent on pedal release instead of pedal push (see issue #24)
+
+## SysEX implementation
+Since v. 2.0 the device has a full set of custom System Exclusive messages that you can use to can configure what kind of commands/codes every button and drawbar sends.
+
+An editor is already available to configure the device. You can find it here: https://github.com/garubi/Web-editor-for-MIDI-Drawbars-Commander
+
+**Format for the requests:**
+
+`F0 X_MANID1 X_MANID2 X_PRODID X_REQ COOMAND vv F7`
+
+**Format for the reply:**
+
+`F0 X_MANID1 X_MANID2 X_PRODID X_REP OBJECT (Reply COdes) vv F7`
+
+**Manufacturer ID and Product ID**
+
+* `X_MANID1 = 0x37` // Manufacturer ID 1
+* `X_MANID2 = 0x72` // Manufacturer ID 2
+* `X_PRODID = 0x09` // Product ID
+
+**Where ACTION is:**
+* `X_REQ = 0x00` // Request
+* `X_REP = 0x01` // Replay
+
+**Where COMMAND is:**
+* `X_FW_VER 			= 0x01`
+// Firmware version. Replay vv is VERSION_MAJOR VERSION_MINOR VERSION_PATCH.
+* `X_ACTIVE_PRESET 	= 0x02` // The active preset. Replay vv is (byte) Active preset id [0-3].
+* `X_CTRL_INFO 		= 0x03` // Reply with info about the controls: 1) Number of presets slots (PRESETS_COUNT), 2) Buttons number (BTN_COUNT), 3) Drawbars number (DRWB_COUNT)
+* `X_REQ_CTRL_PARAMS = 0x10` // Current settings for a control: PRESET_ID CTRL_ID. Reply vv is: PRESET_ID CTRL_ID UPP_Type UPP_Prm UPP_Min UPP_Max UPP_Ch UPP_behavior LOW_Type LOW_Prm LOW_Min LOW_Max LOW_Ch LOW_behavior ALT_Type ALT_Prm ALT_Min ALT_Max ALT_Ch ALT_behavior
+* `X_SET_CTRL_PARAMS = 0x11` // Send the settings for a control (but doesn't save it): PRESET_ID CTRL_ID UPP_Type UPP_Prm UPP_Min UPP_Max UPP_Ch UPP_behavior LOW_Type LOW_Prm LOW_Min LOW_Max LOW_Ch LOW_behavior ALT_Type ALT_Prm ALT_Min ALT_Max ALT_Ch ALT_behavior. Reply vv is 0 if is all right, an Error code if something went wrog
+* `X_SET_PARAM 		= 0x12` //Send a setting for a single parameter (but doesn't save it): PRESET_ID CTRL_ID PARAM_ID (0-18) param value;
+* `X_CMD_SAVE_PRESET= 0x7F` // Save the Preset to the non volative memory: vv is PRESET_ID. Reply vv is 0 if all went ok, an error code if someting wen wrong
+
+**REPLY CODES**
+* `X_OK = 0x00`
+* `X_ERROR = 0x7F` // Something went wrong. It will be followed by one of the following error codes
+
+**ERROR CODES**
+* `X_ERROR_UNKNOWN = 0x7F` //127
+* `X_ERROR_PRESET  = 0x10` //16
+* `X_ERROR_CONTROL = 0x20` //32
+* `X_ERROR_PARAM   = 0x30` //48
+
+## Factory restore
+You can restore the presets factory defaults with the following procedure
+- **turn off** the MIDI Drawbars Comamnder (i.e. detach from the USB cable)
+- **press and hold the *ALT* button while turning on the Commander** (i.e. attach the USB cable). This will boot the Commander in *Reset mode*. The "*Leslie fast*" button's led will start blinking
+- **while holding the *ALT* button, press the blinking "*Leslie fast*" button** to wipe the memory and reload the factory presets. The led will stop blink.
+- **TODO: how to know when the restore finish?**
+- Now **release the *ALT* button**: the Commander will exit from the *Reset mode* and it's ready to perform using the default parameters.
 
 ## Changelog:
 - v. 1.3.6 Fix issue with the Vibrato selector (isssue #70)