2. layout

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1. speaker
2. volume
3. help
4. tempo
5. main modes

6. tape edits
7. tape transport
8. rewind/forward, octave shift +/-, step forward/back
9. shift

10. display
11. T1-T4
12. color coded encoders
13. mic/input
14. album/com

15. sound 1-8
16. sequencer
17. musical keyboard
18. built-in microphone
19. VU/battery indicator

the layout of the OP-1 is divided into different groups for easy reading and intuitive workflow.

turn the Volume knob to set the master volume.

The four color encoders 
are related to the graphical interface on the display.
A green graphical element or text hints that the green encoder will change its value or position.

on the right side of your 
OP-1 you find the built in microphone and VU / battery LEDs.

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