Then I code a program to do an average on time difference of midi event.

class tick_adjust {

    // ------------ LATENCY --------------
        196::ms => dur latency;
    48::ms => dur jitter_mean;
        [5 , 8, 16, 24, 32] @=> int refresh_rate[];
    0=> int refresh_index;

        time ref, next;
        0 => int started;
      0::ms => dur delta_mean;
        0 => int cnt;


        fun void midi_ev(int in) {
        // in == 1 : Bar (4 beat) start
        // other : other beats

                if (!started) {
          if (in == 1) {
            now => ref;
            ref - latency - jitter_mean => ref => next;
            MASTER_SEQ3.update_ref_times(ref, data.tick * 4 );
            <<<"UPDATE 1st ref">>>;
            1=> started;
          }

                }
                else {
                    now => time midi_time;
                    next  - (midi_time - latency - jitter_mean) => dur delta;
//                    midi_time- next + latency  => dur delta;

                    // ------------ MEAN ---------------
//                    delta * 0.05 + delta_mean * 0.95 => delta_mean;

                    delta * (1. / (refresh_rate[refresh_index] $ float) )  + delta_mean *(1.- ( 1. / (refresh_rate[refresh_index] $ float ))) => delta_mean;

                }

        if (started) {
          cnt + 1 => cnt;

          if (cnt == refresh_rate[refresh_index]){
            next - delta_mean => ref => next;
            MASTER_SEQ3.update_ref_times(ref, data.tick * 4 );
            <<<"UPDATE delta_mean: ", delta_mean/1::ms ," refresh rate: ", refresh_rate[refresh_index] >>>;
            0::ms => delta_mean;
            0=> cnt;
            if (refresh_index < refresh_rate.size() - 1){
              refresh_index + 1 => refresh_index;
            }
          }

          next + data.tick => next;
        }
        }


}



"Scarlett 2i4 USB MIDI 1" => string device;
MidiIn min;
MidiMsg msg;
// open the device
for(0 =>  int i; i < 8; i++ )
{
        // open the device
        if( min.open( i ) )
        {
                if ( min.name() == device ) {
                <<< "device", i, "->", min.name(), "->", "open as input: SUCCESS" >>>;


                break;
                }
                else {
//                    min.close();
                }

     }
        else {
                <<<"Cannot open", device>>>;    
            break;
        }
}

<<< "MIDI device:", min.num(), " -> ", min.name() >>>;

tick_adjust ta;

while( true )
{
    min => now;

    while( min.recv(msg) )
    {
        <<< msg.data1, msg.data2, msg.data3 >>>;
        if (msg.data1 == 144 && msg.data2 == 36 && msg.data3 == 100 ){
      // first beat of for
      ta.midi_ev(1);
    }
    else if (msg.data1 == 144 && msg.data2 == 24 && msg.data3 == 100 ) {
      // other beat
      ta.midi_ev(0);
    }

    }
}