Reverse Reverb Effect is the effect that you hear before a vocal or riff starts in a tune that sounds like a sucking sound. This effect is easy to create using your current sequencer and audio editor.

First, you need to open your sequencer, and write your catchy riff or record your vocal sample. You can listen to your riff/vocal with Reverb and Delay whilst writing it if you like, but make sure it isn't applied permanently. Once you are happy with it, export the riff/vocals without the effects into a wave file.

Next, you need to load the sample you have created into an audio editor, then using the tools available, reverse the sample so that it is playing backwards. Save this sample with a new name, such as vocalbackwards.wav. Load this sample into your sequencer, then load up your delay and reverb plugins and choose the settings you will be using in the track. Turn the knob in the reverb plugin so that its 100% wet. Now, save the reversed riff/vocals WITH the effects and make sure that the trailing echo is also saved into the wave file, save the file as something like vocalbackwardseffect.

Now, load the new sample into your audio editor, and flip it so that its playing the correct way again. Now you can hear the sucking reverse reverb sound at the beginning. But you don't want the rest of the riff/vocal as there is too much effects on it. So, snip of the rest of the track using the tools available, making sure that you have the sucking sound without the rest of the riff/vocals. Now save it as something like reversereverbvocal.wav.

Now you can load it into your sequencer and place it into your track before your vocal/riff to give your track that extra something.