This is how to assign the 4 cores to Pianoteq on startup (2,3,4,5 are the 4x high-performance cores).
When Ubuntu-MATE was doing the core load-balancing, it did a poor job. Ubuntu-MATE mostly overloaded the first 2x low-performance cores and under-utilized the 4x high-performance cores (grrrr ...). Eventually it would re-distribute the load to the other cores, but for live music, it was too slow. By the time it figured out there was an "intense musical event" happening, it was too late, the moment had passed. Performance in Pianoteq was sub-par, the program was always gasping for air.taskset -c 2,3,4,5 'Pianoteq 7 STAGE'
After the 4x cores are assigned to Pianoteq, it gets super-charged, performance sky rockets. There are still polyphony limits with the Odroid N2+/Amlogic chip, but for everyday playing and performance Pianoteq runs better on the Odroid N2+ than my 2013 MacBook Air (i5-5250U).
Here's the normal core load-balance with Pianoteq and Ubuntu-MATE's default load-balancing. Notice the 1st low-performance core is overloaded.
Here's the core load-balance with Pianoteq assigned to the 4x high-performance cores (CPU3,4,5,6). Notice the high-performance cores have a nicely distributed load. Also notice the first 2x low-performance cores are free to attend to OS requests.