An audio power meter, although I ran into a problem with part of the design. The circuit has 4 display modes; Dot, Bar, Dot with delay, and Bar with delay (delay meaning that there is a second VU meter connected to the LEDs in the same way as the first, but it's peak detector has a higher capacitor). The problem is when I switch to the 2 delay modes, the 3915 working the "delay" LED is not bright enough to see at a respectable distance, and if it's left alone long enough it begins to mess with the regular VU meter. The regular VU is connected as the "Low cost 60dB display" shown in the data sheet. I'm thinking that connecting R-Lo of the higher meter to R-Hi of the lower meter then I might be able to simplify the design a little bit.