Using the middle Quick Knob, you can filter by effect type – Delay, Distortion, Reverb, etc. But once you’ve chosen a category, as you turn SELECT/PEFORM, the H90 doesn’t have another option but to show you presets in alphanumerical order. Using the third Quick Knob, you can narrow it down by a specific algorithm within that Category. Example Quick Knob 2 set to Delay, Quick Knob 3 set to Head Space, as you turn SELECT, it will only show you presets in Head Space in alphanumerical order.