Using android phone as source for tone board 1

i am using a oneplus 5T running lineage18.1 (android 11)

is it possible to use otg (usb c) to provide the digital input to the ktb ? i have an adapter that allows me to provide 5v power from a standard charger, but there seems to be no connection

the same phone successfully drives a stoner acoustics ud130 using neutron player without extra power needed

is this a driver issue ? if so, can you please advise what i need to “add” to android to make it connect to the ktb usefully ?