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your OP-1 is designed to be easy to use, so the most important functions are located on the first keys to the left on the upper row. the four keys are grouped together and are called main modes.
the four main modes are: synthesizer, drum, tape and mixer.
example: all keys with orange symbols are related to the tape because the tape symbol is orange.
because each key has a dedicated symbol and color to make it easy to navigate through the different screens and to find the appropriate key related to the currently active mode.
for synthesizer you undo edits and tweaks that you made to the sound, and revert to the preset.
for drum you undo edits and tweaks that you made to the sound, and revert to the preset.
for tape you enter the tape erase function.
for mixer it takes you to the signal flow screen
synthesizer using string engine.
drum using a sample.