[LAD] Midi Beat Clock to BPM

Hi I try to fetch the bpm from the Midi Clock, and stumble over "jitter". So I start to collect data for a larger amount of time, but it wouldn't help. Here is what I do: else if ((in_event.buffer[0] ) == 0xf8) { // midi beat clock clock_gettime(CLOCK_MONOTONIC, &ts1); time0 = (ts1.tv_sec*1000000000.0)+(ts1.tv_nsec); static int collect = 0; static int bpm = 0; bpm += ((1000000000 / (time0-time1) / 24) * 60); // nanosec to bpm collect+=1; if (collect >=30) { set_bpm_val(bpm/collect); collect = 0; bpm = 0; } timed = time0-time1; // printf("Midi clock event %X time0 %f time1 %f timed %f ts1.tv_nsec %lu\n",in_event.buffer[0], time0, time1, timed, ts1.tv_nsec); time1 = time0; } else if ((in_event.buffer[0] ) == 0xfa) { // midi clock start printf("Midi clock start\n"); //set_ctr_val(MIDICLOCK, 1); } else if ((in_event.buffer[0] ) == 0xfb) { // midi beat clock continue //set_ctr_val(MIDICLOCK, 1); printf("Midi clock continue\n"); }else if ((in_event.buffer[0] ) == 0xfc) { // midi beat clock stop //set_ctr_val(MIDICLOCK, 0); printf("Midi clock stop\n"); } else { printf("CC number %x\n", in_event.buffer[0] ); } tim0 and time1 are set as double. I experience jitter around 1 or 2 beats around the "original bpm set in the master. When master is set to 360 I receive 374. How do you usually fetch the bpm from Midi Clock, any pointer will be welcome. regards hermann