fluidsynth and latency on evbarmv7hf

[trebol <trebol4444%gmx.com@localhost>]

Hello,

I'm trying to use fluidsynth with a midi keyboard on a rpi2 and 
orangepi-pc. The settings: buffer size, number of buffers, output freq., R 
0, C 0, ... nothing seems to affect the latency in a noticiable way.
Only audio.realtime-prio seems to reduce the latency (obviously), but 
kern.sched.pri_max is not writable and 63 is too low.

Anyone has expirience with this, configuring fluidsynth or recompiling the 
kernel with a high value of kern.sched.pri_max?

Thanks in advance,
trebol.

==============================
The last mail went without some words, sorry, new MUA...