The Roland XV-88 has the same joystick as the XP-30 (with a MUCH longer range for the modulation) I just setup one of the controllable sliders to do modulation..... you could use a CC pedal too. It works fine for me.

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John 3:16 For God so loved the world, that He gave His only Son, that whoever believes in Him should not perish, but have everlasting life.