User ManualTable of ContentsSAFETY PRECAUTIONS Usage Precautions2Features4Terms Used in This Manual5Controls and Functions / Connections6Selecting a Patch8Using the Tuner10Using the Rhythm Function12Editing a Patch14Storing/Copying Patches16Using the Built-in Expression Pedal18Using the Feedback Control20Manual operation of feedback control20Automatic detection of feedback frequency21control function22Using Manual Mode23Other Functions24Making settings for the built-in expression pedal24Adjusting the sensitivity of the built-in expression pedal24Using an external expression pedal (FP01/FP02)25Using a foot switch (FS01)25Using the A2.1u as audio interface for a computer26Use as a direct box27Starting the A2.1u in HI-GAIN mode28Restoring Factory Defaults28Linking Effects29CONTROL module and GLOBAL module29Effect Types and Parameters30How to read the parameter table30MODEL31MIC32COMP/LIMIT32LO EQ32HI EQ33ZNR33MOD/EFX33DELAY/REVERB35CONTROL37GLOBAL38Troubleshooting38Specifications39Size: 2.04 MBPages: 43Language: EnglishOpen manual