The heart of the circuit is the tone (pitch) display section, based on the popular LM3914 display driver. This device drives ten LEDs in a linear display, with programmable endpoints and the choice of `dot` or `bar` modes of operation. Furthermore, it is possible to `chain` multiple devices for displays of virtually unlimited size.
TONE DISPLAY - schematic

At this point we should note that the notes we are displaying represent a logarithmic scale, In other words, each time we double the frequency (go up an octave), the control voltage to our display section should increase by a fixed amount (about 1.5 volts

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