wondering if anyone knows a simple circuit that will cause 1 or more led's to flash when a note is played.
Look up LM3915 at National Semiconductor.
They are used for building VU meters mainly.
Could just build an opamp circuit and set the quiescent gain at a threshold just a tad lower than the LED turn-on voltage. That way, an input signal would light 'er up. Pretty simple, depends on what you want to do with the flashy LED and how many you need....
You could try the first part of the Clari(not) schematic found on this forum.
thanks for the suggestions. i'll try some of those and let you know what works/doesn't