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Very little cost even without 1v/oct, could be done externally with a 7-segment display with LED backlight 240x128 LCD display 320x340 RS-232 I2C or SPI http://www.lcd-module.com/fileadmin/eng/pdf/grafik/edip160-7e.pdf LCD-graphical display with a diode matrix to select segments from each step. Could add a global/master pitch control/modulation function with a capacitor / resistor pair, see Fireball's hard sync to schematic, laid.

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