In STEREO mode, width and volume controls are enabled to optimise the pseudo-stereo sound. The PAD switch allows you to attenuate the line level signal down to instrument level. StereoMaker can also be used as a direct box to convert an unbalanced signal to a balanced signal, making it a useful tool for keyboardists and recording studios. PSEUDO STEREO EFFECT (Y) A simulated stereo effect is generated using analog complementary comb filters. This unique implementation makes it possible to simulate the mixture of direct and reflected sound waves in a room in a very realistic way. This effect is 100% analog and safe to mix back into mono, no side effects. OUT-OF-PHASE SIGNALS Sometimes reverse phase effects can occur resulting in a "non-distinct", "hollow sound". The reason might be that two guitar amps has been used with different number of gain stages. The StereoMaker has a built-in 180 degrees polarity reverse circuit to phase-match amps. Just pull the output plug half way out to get the reverse phase.