Systems and method of the present invention provide for one or more server computers configured to register a domain name; receive a request to: generate a file folder linked to an online storage account owned by a user; and map a URL, comprising a sub domain concatenated to the registered domain name, to the file folder. A user input of a variable value is received and, in response, distribution of the audio signals is transitioned from the first mode to the second mode, the extent of the transition being variable based on the value of the user input. A return signal will pass the target threshold only when there is an abrupt reduction in range, indicating the presence of a target.