default or selected kernelversion does not have config value CONFIG_LINE6_USB_DUMP_MIDI.
Result is shown for kernelversion 6.2.5

dump MIDI messages


Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>Line6 USB support
└─>dump MIDI messages
In linux kernel since version 2.6.37 (release Date: 2011-01-04)  
Say Y here to write MIDI messages sent to and received from
Line6 devices to the syslog.

If unsure, say N.