macsig automatically updates ampsig whenever the current iTunes song changes or when iTunes pauses/plays/stops. Every time macsig updates, it sends the information you specified in the key/value table, whether it is song information or computer information.

If you don't use iTunes, macsig will update only once an hour since it does not receive update messages. You may want to increase this interval with the force update slider if you are sending data that changes often.

Note: Forced updates are slightly less efficient than automatic updates.

Note: ampsig automatically calculates linear changes in uptime and song position.