The iD2+ has the ability to remember the monitor volume that was used before it was powered down.
To enable this feature; open the iD control application, and navigate to the settings tab.
The settings tab will now appear within iD Control, and the ‘volume recall’ option can be accessed here:
Enable this option to allow your iD2+ to remember your last used volume setting. Disable this option if you would like your iD2+ to forget the last setting, and always boot up with a monitor level of -128.