Algorithm View; Algorithm (Algorithm Number); Feedback (Feedback Level); Operator Level - Yamaha MODX7 Reference Manual

Reference
Performance
 Algorithm view
This appears only when the currently selected Part is the Normal Part (FM-X), and Motion Control 
Overview  Slider Function [Elem/Op Control] button is ON.

Algorithm (Algorithm Number)

Changes Algorithms.
Settings:
See the Data List PDF document.
NOTE Tapping the Algorithm image calls up the Algorithm Search display.

Feedback (Feedback Level)

Waveforms can be changed by feeding some of the signal generated by an operator back through that
operator. This allows you to set the feedback level.
Settings: 0–7

Operator Level

Determines the output level of the Operator.
Settings:
0–99
MODX Reference Manual
Edit Search
Operator Level
Utility Live Set
Performance
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