Reply to s4 with 4 fx units question

I am currently using an s4 with 4 fx units but I cant get the fx select buttons on s4 to work qs if they were on 2 fx units. Only way I cqn get it to work is by importing dj ranking s instant grat mapping, then import my mapping for my launchpad effects, then delete instant grat mqpping. I can't find any preferences to do this.

Hope it makes sense.

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