sound effects(echo,bass,repeat,trible)

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hi all
I have built my 100W audio amplifier
I need now to make a preamplifier so it gives amplifies the mic(around 10mv) signal and raise it to the level of the audio amplifier(1.5v)
I couldn't find any circuits that can put some effects (echo, bass, trible and repeat) to the mic signal , all I found was a single transistor to amplify only
if any body have any experience about sound effects and mic amplifiers plz share?
 
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