Hi, Elana, Herbert:
What synth/software are you using for your organ sounds, Elana? Chances are that it has some kind of reverb or echo effect built in. I use a freeware program called Miditzer, which is a virtual Wurlitzer theatre organ (
www.Virtualorgan.com). The amount of reverberation can be controlled by the program's setup panel.
Reverberation is usually controlled by Midi CC #91 (Effect Level). You can manipulate that by using the GraphOverNotes(TM) feature and selecting the appropriate CC using the C?TL icon and its pop-up menu.
Good luck.
David