SoundFormat format = new(FourtyEightKHz, SixteenBit, Monaural);
var rightChannel = new TriangleSoundChannel(100, format, PanType.Right);
var music = 
"""
^E ^E ^E
^C ^E ^G G

 

^C G E
A B Bb A
G ^E ^G ^A
^F ^G ^E ^C ^D B
""";

rightChannel.Process(music);

public class FixedTriangleChannel : SoundChannelBase
{
    /// <summary>
    /// constructor コンストラクタ
    /// </summary>
    /// <param name="format">format of the sound. 音のフォーマット</param>
    /// <param name="tempo">quarter note/rest per minute. 一分間の四分音符・休符の数</param>
    /// <param name="panType">sound direction. 左右どちらから音が出るか</param>
    /// <param name="capacity">the total number of sound components the internal data structure can hold without resizing. 内部データ構造がリサイズされずに保持できるサウンドコンポーネントの総数。</param>
    /// <exception cref="ArgumentOutOfRangeException">Tempo must be non-negative and greater than 0.</exception>
    /// <exception cref="ArgumentOutOfRangeException">Capacity must be non-negative.</exception>
    public FixedTriangleChannel(int tempo, SoundFormat format, PanType panType, int capacity) : base(tempo, format, panType, capacity) { }

    /// <summary>
    /// constructor コンストラクタ
    /// </summary>
    /// <param name="format">format of the sound. 音のフォーマット</param>
    /// <param name="tempo">quarter note/rest per minute. 一分間の四分音符・休符の数</param>
    /// <param name="panType">sound direction. 左右どちらから音が出るか</param>
    /// <exception cref="ArgumentOutOfRangeException">Tempo must be non-negative and greater than 0.</exception>
    public FixedTriangleChannel(int tempo, SoundFormat format, PanType panType) : base(tempo, format, panType) { }

    public override ushort[] GenerateWave()
    {
        var result = new List<ushort>();
        foreach (var soundComponent in SoundComponents)
        {
            var wave = soundComponent.GenerateWave(Format, Tempo, new FixedTriangleWave());
            FadeInOut(wave);
            result.AddRange(wave);
        }
        return result.ToArray();
    }
}

/// <summary>
/// the triangle wave. 三角波
/// </summary>
public class FixedTriangleWave : WaveTypeBase
{
    [Obsolete("Use 'GenerateWave(SoundFormat format, int length, int volume, double hertz)'")]
    public override ushort[] GenerateWave(SoundFormat format, int tempo, int length, int volume, double hertz)
    {
        CheckGenerateWaveArgs(tempo, length, volume, hertz);
        return GenerateWave(format, length, volume, hertz);
    }

    public override ushort[] GenerateWave(SoundFormat format, int length, int volume, double hertz)
    {
        CheckGenerateWaveArgs(length, volume, hertz);
        var result = new List<ushort>(length);
        var unitWave = GenerateUnitWave(format, volume, hertz);
        for (var i = 0; i < length / unitWave.Count; i++)
        {
            result.AddRange(unitWave);
        }
        for (var i = 0; i < length % unitWave.Count; i++)
        {
            result.Add(0);
        }
        return result.ToArray();
    }

    private List<ushort> GenerateUnitWave(SoundFormat format, int volume, double hertz)
    {
        var repeatNumber = (int)format.SamplingFrequency / hertz;

        var result = new ushort[(int)repeatNumber];

        var slope = ushort.MaxValue / (repeatNumber / 2);

        var volumeMagnification = volume / 100d;

        var halfCount = (int)(repeatNumber / 2);

        for (var i = 0; i < halfCount; i++)
        {
            var sound = (ushort)(slope * (i + 1));
            sound = (ushort)(sound * volumeMagnification);
            result[i] = sound;
            result[result.Length - i - 1] = sound;
        }

        if (result.Length % 2 == 1)
        {
            result[halfCount] = (ushort)(ushort.MaxValue * volumeMagnification);
        }

        return result.ToList();
    }
}