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24 Parameters Light effect (mix=0.1) Amp Medium effect (mix=0.25) Strong effect (mix=0.5) 0 dB 250 Hz 2435 Hz Frequency Figure 13: Frequency response of a Phaser module. Effect of the mix between wet and dry signal on the frequency response. but it starts to oscillate by an amount which increases as the Depth knob is turned clockwise. 5.2.5 Reverb The Reverb effect is used to recreate the effect of reflections of sound on the walls of a room or hall. These reflections add space to the sound and make it warmer, deeper, as well as more realistic since we always listen to instruments in a room and thus with a room effect. The ratio between the direct sound and the room response is adjusted with the Mix knob. This parameter is used to adjust the perceived distance between the source and the listener. In its leftmost position, only the direct sound is heard while when fully turned to the right, one only hears the room response. 5.2.6 The Hammer Module The Hammer module is used to simulate the force impact produced by the piano hammer when striking the fork of the piano. The Noise knob is used to control the amount of noise generated during the impact between the hammer and the fork. Turning the knob clockwise increases the amplitude of the noise.