I believe the new presets (about 58) will be placed between 800 and 870, while the TF and MF presets will live from 900 on. The presets stored to a card from 500 on should be fine, UNLESS they are stored to the slots I just mentioned for the new presets+pedals presets. The best thing you want to do is to back up all your works on a computer so that you'll be free to adjust placement later on, when V4.0 will be out. Just in case….

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