I am trying to add reverb while I'm singing. But I do not want to record
the reverb.

my mic is on the channel 1 on my Behringer UB1204FX mixer.
The mixer's ALT3-4 is connected to the computer soundcard L/R input.
The computer soundcard L/R output is connected to the mixer channel 7/8.
Channel 1's FX knob is turned all the way down so that I don't send any
effects from the channel 1.
Channel 7's FX knob is turned way up, so I can add effect to the output
sound from the soundcard (I sense no delay between my singing and the
output sound so I'm using the output sound to monitor my singing).

So I record using a sequencer, thinking that my voice was recorded without
the reverb. But when I play back I still hear that the reverb was
recorded along with the vocal. When I hear the playback through the
channel 7/8, ofcourse I turn the FX knob on that channel all the way down
(so I could hear what was recorded). But I still hear the reverb. Help me.

The mixer topview picutre is on the following site.

http://www.Behringer.com/02_products/proddetail.cfm?lang=ENG&id=UB1204FX&t

ype=225',%20780,400)

thanks,
unsaint