I know someone who was on Abilify, and they weren't able to trip off of even a large dose of 2C-T-2. No visuals, nothing. I have also watched other people abort bad trips with the compound. If you do take a psychedelic or empathogen whilst on this stuff, you definitely won't experience the "proper" range of effects of your chosen compound, and it will be significantly less enjoyable than if you weren't taking it.
Please note: you should be able to get effects from ketamine, but again there will be differences in the experience. You will feel the NMDA antagonism of the ketamine, but the Abilify will still be exerting it's effects on your entire brain functioning and so it will not be the same. I would presume the visual effects would be markedly less intense and there will be great qualitative differences.
In all honesty, it just won't be worth attempting to trip whilst taking it.