既存のAudioチャンネルを別チャンネルへ転送

TransCh.cs

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

// 既存のチャンネルを別チャンネルへ転送
public class TransCh : MonoBehaviour {

    [System.Serializable]
    public class TransChannel
    {
        public int org = 0;
        public int dst = 1;

        public float orgVolume = 0;// 元の音量（完全移行する場合は0にして消す）
        public float dstVolume = 1;// 移行先の音量
    }

    [SerializeField, Tooltip("デバッグ用：入力されているチャンネル確認用")] int debug_channelsCount;

    [SerializeField] TransChannel[] transChannels;


    void OnAudioFilterRead(float[] data, int channels)
    {
        debug_channelsCount = channels;

        int leng = data.Length / channels;
        for (var i = 0; i < leng; i++)
        {
            for (int j = 0; j < transChannels.Length; j++)
            {
                TransChannel tCh = transChannels[j];
                if (tCh.org < channels && tCh.dst < channels)
                {
                    int index = i * channels;
                    float orgData = data[index + tCh.org];
                    data[index + tCh.dst] = orgData * tCh.dstVolume;

                    data[index + tCh.org] = data[index + tCh.org] * tCh.orgVolume;
                }
            }
        }
    }
}