Mostly working on OSX /w rtaudio now

Looks like just some priority tweaks remain

src/CubicSDR.cpp

@@ -47,6 +47,14 @@ bool CubicSDR::OnInit() {
 
     AppFrame *appframe = new AppFrame();
 
+    int main_policy;
+    struct sched_param main_param;
+
+    main_policy = SCHED_OTHER;
+    main_param.sched_priority = sched_get_priority_min(SCHED_OTHER);
+
+    pthread_setschedparam(pthread_self(), main_policy, &main_param);
+
     return true;
 }