Boss DD-8 Reference Manual page 8

Connections
Caution when making connections
* To prevent malfunction and equipment failure, always turn down the volume, and turn off all the units before making any
connections.
* Do not use connection cables that contain a built-in resistor.
* Before turning the unit on/off, always be sure to turn the volume down. Even with the volume turned down, you might hear some
sound when switching the unit on/off. However, this is normal and does not indicate a malfunction.
* 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
* 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.
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