Hello, I use this card and can generate MPX on raspberry. We know the equipment is not strong when it comes to PI3, ODROID is already better. You have to compromise because the card buffer will be smaller, if many add-ons turn on, the most using processor is ADVACED CLIPPER
in the movie but you do not need to turn on "jackd -d .... etc"
now there is one script in bash that runs everything else two relays to control the transmitter