Dave Smith Instruments SYNTHESIZERS

Ok, so I know that the Push It parameter Toggle will let a note, sequence or arp drone/play. But I noticed that on some programs, with PushIt Toggle On, I push the PushIt button which will continuously play a sound AND I can actually play OTHER notes (from the keyboard) while the pushit sound plays on. Whereas on other programs, playing a key with the PushIt Toggle On will actually interrupt the PushIt sound. When I take my finger off the key, the PushIt sound will of course automatically play again. What is the parameter that turns this function on and off?? Hopefully this is not too confusing.