Many thanks Greybeard for responding . I understand what you said perfectly . Perhaps I didn't make my question clear enough. It seems to me that it should be possible to select one of the default film simulations with their default (zero) settings with a single action, even though all 7 custom settings slots are filled. As you say, changing the film simulation in any one of the custom slots does not effect any of the other custom settings for that slot. The only way I see to be able to have custom recipes AND be able to select default film simulations is to have one custom slot for a chosen film simulation but with all settings unchanged at their zero values. Then, different film simulations can be simply selected in that one custom slot.