Hello alibongo5,
the OSC modifiers are non-realtime parameters. That's why they don't appear in your list. Non-realtime does mean that every time when a modifier or modifier value is changed, Gladiator has to recalculates thousands of waveforms. This is technically necessary for the HCM synthesis. The preprocessing is done in a second idle thread in the background to avoid CPU spikes and audio dropouts. During this time the display shows 'preprocessing'.
You can find furher details about the modifiers in the handbook.
Best Regards,
Markus Feil