thaumic-machinery/src/main/resources/assets/thaummach/sounds.json

{
    "popen": {
        "category": "master",
        "sounds": [
            {
                "name": "popen",
                "stream": false
            }
        ]
    },
    "pclose": {
        "category": "master",
        "sounds": [
            {
                "name": "pclose",
                "stream": false
            }
        ]
    }
}