Build an interface to program/reprogram the PRESETS and store them in eeprom

[garubi]

This would require additional hardwarae: a I2C eeprom, since the TeensyLC eeprom is too small to store even 1 of the 4 presets.
For Write-Read to i2c EEPROM could be useful this library:
https://forum.pjrc.com/threads/24754-I2CEEPROMAnything

We can build an editor using CTRLC (standaolne or VST) and sending the configuration as SysEX or NRPN

Good example of protocolo used to to configure a MIDI controller with SysEx:
https://github.com/paradajz/OpenDeck/wiki/SysEx-Configuration

utile esempio di come salvare configurazioni in eeprom:
https://www.norwegiancreations.com/2017/09/how-to-load-and-save-configurations-on-an-arduino/

[garubi]

All you need to know about RPN and NRPN:
http://www.philrees.co.uk/nrpnq.htm

if we choose to use NRPN this issue contains an useful Library and lot of useful consideration:
FortySevenEffects/arduino_midi_library#60