Power indicator two channels 120 led KA2281 2 ◊ 5-channel LED level meter for stereo tape recorders and home stereo This is an integrated circuit consisting of a 2-channel LED level meter driver, designed for use in systems. Can be configured as two channels and one channel.
So stereo? Because one 3915 has an output for 10 LEDs. And "better" because it has better tailored thresholds for lighting subsequent LEDs. Here (for two channels clipped into one) on the KA2281 I do not see the possibility of obtaining an even scale.