Hi and welcome to Arturia forums.
I attach some example presets. Just import the bank in your ARP and you'll find them in banks LBH VP. I have created the TYPE Tutorial too.
Read the Comments in each preset and try that out. Then you can hear the result for a better understanding - hopefully.
The MIX A/B slider mix the A and B input. The MOD IN modulate the slider according to the sliders position with the amount you set.
You can in example mix OSC wavedorms from the same or from 2 OSCs together.
The LINK switch link Voltage processors together.
The INVERTER (Arrow knob) invert the output signal.
The SMOOTH/ LAG knob do just that. (When used with example a audioble waveform, then this have a huge impact on the smallest amount.)
You can in example shape a OSC waveform, a Envelope curve and so on.
I suggest you exsperiment.
What you can use this for is much about your imagination. I only show some examples.
I hope this text and the attached presets helps to understand the Voltage Processors.
BTW: This is also an example i have posted in the old forum. See post 2 in the thread:
https://forum.arturia.com/index.php?topic=92821.msg151714#newEDIT: BTW: If you find the original hardware ARP 2600 manual on the web, then you can get more informations. I attach a page about this topic. EDIT END