When summed to mono, a hard panned oscillator outputs a signal 6 dB quieter than a centred oscillator. This is due to a centred oscillator outputting the same signal twice, one for each stereo channel. It would be desirable to implement a pan law in the oscillator pan control, so that the loudness of the signal decreases as it moves from the sides to the centre. A good compromise adopted by most of the industry is -3 dB. This would ensure that the perceived loudness of the output signal stays the same regardless of the pan position or the latitude of the listener. I guess that this also applies to the pan controls of the other synths.
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