Samplerbox using RPI and Arduino

hello

i would like to run samplerbox on Rpi and an Arduino with sensors that would generate serial signals when triggered.
Ttymidi seems to be the solution to convert serial signal into MIDI signal.
With "Aconnect -i", my arduino is well recognized.
BUT i don't see samplerbox when running the "aconnect -o" command.
Thus i can not link both parts.

Any idea to connect samplerbox to Arduino output (through ttymidi)?

Thanks for your help