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To programmatically alter the Bluetooth codec in Kotlin using API 33, you can use the following steps:

1. Obtain an instance of the BluetoothAdapter.

val bluetoothAdapter = BluetoothAdapter.getDefaultAdapter()

1. Check if Bluetooth is enabled.

if (!bluetoothAdapter.isEnabled) {
    bluetoothAdapter.enable()
}

1. Get the connected Bluetooth device.

val connectedDevice = bluetoothAdapter.getProfileProxy(context, object : BluetoothProfile.ServiceListener {
    override fun onServiceConnected(profile: Int, proxy: BluetoothProfile?) {
        val devices = proxy?.connectedDevices
        if (devices != null && devices.isNotEmpty()) {
            val device = devices[0]
            // Use the connected device
        }
        bluetoothAdapter.closeProfileProxy(profile, proxy)
    }
    override fun onServiceDisconnected(profile: Int) {}
}, BluetoothProfile.A2DP)

1. Obtain an instance of the BluetoothA2dp class.

val bluetoothA2dp = BluetoothA2dp::class.java.getMethod(
        "getProfileProxy",
        Context::class.java,
        BluetoothProfile.ServiceListener::class.java,
        Int::class.javaPrimitiveType)
        .invoke(null, context, object : BluetoothProfile.ServiceListener {
            override fun onServiceConnected(profile: Int, proxy: BluetoothProfile?) {
                // Use the proxy
            }
            override fun onServiceDisconnected(profile: Int) {}
        }, BluetoothProfile.A2DP) as BluetoothA2dp

1. Set the Bluetooth codec using the setCodecConfigPreference method. The parameter to this method is a BluetoothCodecConfig object.

val codecConfig = BluetoothCodecConfig.SOURCE_CODEC_TYPE_DISABLED
bluetoothA2dp.setCodecConfigPreference(connectedDevice, codecConfig)

Note: This code snippet assumes that the target device supports the selected codec.