Question Can I create a preset on the G-System which has both the chorus and phaser FX on

No, this is not possible on the G-System (all versions). The reason is that the Chorus and Phaser FX are both found in the Mod bank in the G-System, and it is only possible to use oneeffect from a given bank at a time. Similarly, it is also not possible to create a preset that has both the Detune and Intelligent Pitchshifter FX on at the same time as these effects are both found in the Pitch bank.