Im about to purchase a new mixer and Im looking at either a pioneer DJM909 or a ttm57. I know this has been covered a lot in this forum but I have one question about the ttm57 that I didn't see while searching.

say on the left turntable there is no effect and its an instrumental, on the right turntable there is an echo effect.
Can you program the echo effect so when you scratch and pull the fader back over to the left channel where there is no effect will the effect keep echoing to get those dubbed out overlapping echos.

Theres a pioneer 400 and an 800 at two of the clubs I play at and they have this capability whereas the djm500 does not.