Bukkit

 ♦ Version 1.5
    Info:
        Finally fixed that annoying bug where a message/sound plays even when it compresses nothing! It sends a configurable message for every single type of item it compresses. If you want a particular item to not send message/play sound, simply don't put anything there. If you want none of them to do anything, simply set messages and/or sounds to false.

None!