{BEEP X Y} - Beeps with a frequency of X and a duration of Y ms.
{DELAY X} - Delays sending the next key of X milliseconds. After the delaying the following key, the subsequent keys will not be further delayed unless there is a default delay value (see DELAY=X). Example: {DELAY 1000} <-- delays subsequent key stroke for 1 second.
{DELAY=X} - Sets the default delay value to X milliseconds. This will cause every key to be delayed X ms. If a value is already set and you specify {DELAY Y} you will have your following key delay Y ms but the subsequent keys will be delayed X ms. Example: {DELAY=1000} <-- all subsequent keys will be delayed for 1 second.