Unity sound wave using line renderers

WaveGenerator.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System.Linq;

/// Creates a wave form based on an audiosource
/// Modified version of http://forum.unity3d.com/threads/making-sense-of-spectrum-data.90262
/// Make sure to plug in the _topLine and _bottomLine line renderers
public class WaveGenerator : MonoBehaviour
{
    AudioSource _audioSource;
    const int SpectrumSize = 8192;
    readonly float[] _spectrum = new float[SpectrumSize];
    public LineRenderer _topLine;
    public LineRenderer _bottomLine;

    public void Start()
    {
        _audioSource = GetComponent<AudioSource>();
    }

    public void Update()
    {
        _audioSource.GetSpectrumData(_spectrum, 0, FFTWindow.BlackmanHarris);

        var bandSize = 1.1f;
        var crossover = bandSize;
        var viewSpectrum = new List<float>();
        var b = 0f;
        for (var i = 0; i < SpectrumSize; i++)
        {
            var d = _spectrum[i];
            b = Mathf.Max(d, b); // find the max as the peak value in that frequency band.
            if (i > crossover - 3)
            {
                crossover *= bandSize; // frequency crossover point for each band.
                viewSpectrum.Add(b);
                b = 0;
            }
        }

        SetLinePoints(viewSpectrum, _topLine);
        SetLinePoints(viewSpectrum, _bottomLine, -1);
    }

    private void SetLinePoints(List<float> viewSpectrum, LineRenderer lineRenderer, float modifier = 1)
    {
        var pointDistance = 0.1f;
        var width = pointDistance*viewSpectrum.Count;

        lineRenderer.SetVertexCount(viewSpectrum.Count);
        lineRenderer.SetPositions(viewSpectrum.Select((x, i) => new Vector3(-width/2 + i*pointDistance, x*34*modifier)).ToArray());
    }
}

warn in line 51
'LineRenderer.SetVertexCount(int)' is obsolete: 'Use positionCount instead.'
fix issue
https://stackoverflow.com/questions/44442631/im-getting-warning-on-linerenderer-setwidth-that-its-obsolete-how-should-i-fix