Perhaps this is what we are looking for:
http://line6.com/data/6/0a06439cb91a5609df67966ca/application/pdf/Helix%20Owners%20Manual%20(REV%20B)%20-%20English%20(%20Rev%20B%20).pdf#page44
This line here, under global presets:
Up/Down Switches
When set to "Presets," FS1 (BANK ) and FS7 (BANK ) change to PRESET and PRESET , where pressing either switch instantly selects the next/ previous preset, without a bank queue. This is useful if you've programmed a fixed set list for your show, and just want to increment through all your tones. You can also quickly change this setting at any time by pressing and holding both the and switches for two seconds.