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This circuit operates as a monostable vibrator. The button at the beginning would be replaced with a gate circuit from a keyboard (5V=on and 0V=off). The two potentiometers work when the diodes allow them to pass current. They work together with the capacitor to create an RC circuit (gradual change between the on and off states). The top potentiometer controls the attack and the bottom potentiometer controls the release. The voltage at the end gets converted to a current through the 5k resistor to scale it between 0-750mA.
Application: Haven't tested this yet, but seems like this could be used as a simple ASR generator for a VCA or VCF. Send the collector of the PNP to the control current pin of an LM13700 OTA. Use the LM13700 in a current controlled amplifier configuration using the datasheet schematic. Alternatively, you could send this control current to a VCF using OTAs as current controlled resistors. (omm,, omm,, omm,, omm) ;)
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