how to create very simple reverb effect? any idea?

There is [freeverb~] that does work well. You might also wanna check "3.audio.examples-G08.reverb.pd" in Help Browser.

tcichan

thanx

or you can use a simply delay line with no feedback, just a delay.
the time is your pre-daleay or early reflections

http://crca.ucsd.edu/~msp/techniques/latest/book-html/node111.html

cha-ching! i'm just saying spend a minute or two with puckette's book, it's some good shit

http://crca.ucsd.edu/~msp/techniques/latest/book-html/node124.html