Boss ODB-3 Owner's Manual download pdf (Page 8)

* Inserting a plug into the INPUT Jack will automatically switch the unit on.

* To prevent malfunction and/or damage to speakers or other devices, always turn down the

volume, and turn off the power on all devices before making any connections.

* If there are batteries in the unit while an AC adaptor is being used, normal operation will continue

should the line voltage be interrupted (power blackout or power cord disconnection).

* Once the connections have been completed, turn on power to your various devices in the order

specified. By turning on devices in the wrong order, you risk causing malfunction and/or damage

to speakers and other devices.

When powering up: Turn on the power to your guitar amp last.

When powering down: Turn off the power to your guitar amp first.

* Always make sure to have the volume level turned down before switching on power. Even with

the volume all the way down, you may still hear some sound when the power is switched on, but

this is normal, and does not indicate a malfunction.

* When operating on battery power only, the unit’s indicator will become dim when battery power

gets too low. Replace the battery as soon as possible.

* The CHECK indicator shows whether the effect is being applied or not. It does not indicate

whether the power to the device is on or not.

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Boss ODB-3 Owner's Manual Page 8