Foton: check for invalid filter settings
1 4 x x has input pass when off, but waits for zero crossing output when switching. 2 2 x x has input zeroed when off, but waits for output to match input when crossing. 1 3 x 0 and 2 4 x 0 have a wait setting, but a 0 cycle timeout. They are equivalent to 1 1 x x and 2 1 x x.