EDIT: This feature was already in there but ill leave the post as is, maybe its useful for someone anyways. the easy way of doing this(copied from the manual: TIP Rotate the main encoder right to display the OFFSET parameter, instead of the PHASE parameter
Just assign one of the encoders to the same cc as the lfo is outputting, Voilà! you now control the amplitude offset of that LFO, make sure to decrease the range a bit to make it more obvious!
Simple but important!
Btw dont forget to use disp when in the lfo page to view the waveform. And that you can chain lfos after another to create more complex waveforms (just set them to the same cc value)
i kinda have a feeling there is other ways of doing this, maybe with the cc automation i step mode… My research continues.