The sound channels used by each sound are defined as follows:
* If soundChannel = 0, use the SQ1 sound channel
* If soundChannel = 1, use the SQ2 sound channel
* If soundChannel = 2, use the NOISE sound channel
* If soundChannel = 3, use the SQ1 and NOISE sound channels
* If soundChannel = 4, use the SQ2 and NOISE sound channels