MidiEvent.Time isn't representing the "Absolute Time" about midi-parser HOT 7 CLOSED

foreach (var track in midiFile.Tracks)
        {
            
            int[] NoteOnWait = new int[256]; //time = [Note]
            foreach (var midiEvent in track.MidiEvents)
            {
                if (midiEvent.MidiEventType == MidiEventType.NoteOn)
                {
                    var time = midiEvent.Time;
                    var channel = midiEvent.Channel;
                    var note = midiEvent.Note;
                    var velocity = midiEvent.Velocity;
                    NoteOnWait[note] = time;
                }

                if (midiEvent.MidiEventType == MidiEventType.NoteOff)
                {
                    var time = midiEvent.Time;
                    var channel = midiEvent.Channel;
                    var note = midiEvent.Note;
                    var velocity = midiEvent.Velocity;
                    var length = time - NoteOnWait[note];

                    // And Some Code here:
                    // Visualize objects:
                    // Object coordinate = (note, NoteOnWait[note]); (x,y)
                    // Size = (x, length)
                }
            }

using MidiParser;
using SFB;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Windows.Forms;
using UnityEngine;

public class MidiRead : MonoBehaviour
{
    public GameObject NotePrefeb;
    public float NoteWidth = 1f;
    public float NoteLength = 0.0001f;
    public float NoteDensity = 10000;

    private MidiFile midiFile;
    private string[] FilePath;
    // Start is called before the first frame update
    void Start()
    {
        var extensions = new[] {new ExtensionFilter("MIDI Files:", "mid")};
        FilePath = StandaloneFileBrowser.OpenFilePanel("Open File", "", extensions, false);
        foreach ( string path in FilePath) { midiFile = new MidiFile(path); }

        GameObject NoteParent = GameObject.FindGameObjectWithTag("Notes");

        foreach (var track in midiFile.Tracks)
        {
            
            float[] NoteOnWait = new float[256]; //time = [Note]
            foreach (var midiEvent in track.MidiEvents)
            {
                if (midiEvent.MidiEventType == MidiEventType.MetaEvent)
                {
                    if (midiEvent.MetaEventType == MetaEventType.KeySignature)
                    {
                        Debug.Log("KeySignature: " + midiEvent.Arg1);
                        Debug.Log("SharpsFlats: " + midiEvent.Arg2);
                        Debug.Log("MajorMinor: " + midiEvent.Arg3);
                    }
                    if(midiEvent.MetaEventType == MetaEventType.Tempo)
                    {
                        Debug.Log("Tempo: " + midiEvent.Arg1);
                        Debug.Log("BeatsMinute: " + midiEvent.Arg2);
                        Debug.Log("What?" + midiEvent.Arg3);
                    }
                    if (midiEvent.MetaEventType == MetaEventType.TimeSignature)
                    {
                        Debug.Log("TimeSignature: " + midiEvent.Arg1);
                        Debug.Log("Numerator: " + midiEvent.Arg2);  
                        Debug.Log("Denominator: " + midiEvent.Arg3);
                    }
                }





                if (midiEvent.MidiEventType == MidiEventType.NoteOn)
                {
                    var time = midiEvent.Time / NoteDensity; //Scale the time because Time is too big.
                    var channel = midiEvent.Channel;
                    var note = midiEvent.Note;
                    var velocity = midiEvent.Velocity;
                    NoteOnWait[note] = time;
                    Debug.Log(time);
                    //Debug.Log(note);
                }

                if (midiEvent.MidiEventType == MidiEventType.NoteOff)
                {
                    var time = midiEvent.Time / NoteDensity; //Scale the time because Time is too big.
                    var channel = midiEvent.Channel;
                    var note = midiEvent.Note;
                    var velocity = midiEvent.Velocity;
                    var length = time - NoteOnWait[note];    //NoteOff time - NoteOn time = length


                    //Debug.Log(note);
                    if (NoteOnWait[note] >= 0)
                    {
                        Transform transform = this.transform;
                        transform.position = new Vector3(Map(note, 21, 108, -8.72f, 8.72f), NoteOnWait[note], 1); // X: Map the note from 21~108 to -8.73~8.72,
                        GameObject InstantiateNote = Instantiate(NotePrefeb, transform);// Generate the object    // Y: NoteOn time = where Y starts.
                        InstantiateNote.transform.parent = NoteParent.transform;        // Make the object's parent = this
                        SpriteRenderer spriteRenderer = InstantiateNote.GetComponent<SpriteRenderer>();
                        spriteRenderer.size = new Vector2(NoteWidth, length * 6.666f);  //(Width, Height) Height = (NoteOff time - NoteOn time) / NoteDensity = "length" block high
                   }                                                                    // Multiply 6.666 is because the object prefeb was 0.15 block high
                    else { Debug.Log("NoteOff appear before NoteOn?"); }
                    NoteOnWait[note] = -NoteOnWait[note];
                }
            }

            /*
            foreach (var textEvent in track.TextEvents)
            {
                if (textEvent.TextEventType == TextEventType.Lyric)
                {
                    var time = textEvent.Time;
                    var text = textEvent.Value;
                }
            }*/
        }
    }

    // Update is called once per frame
    void Update()
    {
        
    }

    float Map(float n, float fromLow, float fromHigh, float toLow, float toHigh)
    {
        return (n - fromLow) * (toHigh - toLow) / (fromHigh - fromLow) + toLow;
    }
}