I always thought the flat LEDS came first...
My ADSR, VCADSR, S&H, VOCODER, SLEW LIMITER, ENV FOLLOWER,
NOISE/RANDOM, CLK DIVIDER, CLK SEQ, LFO'S all have flat LEDs.
I guess the reason is simply money, common round ones must be
cheaper than flat ones, right
I seem to have more flat LED's than round ones, perhaps Mr.D could
just give us a simple explanation.

>John