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"dear dr. coban, just a quick note to thank you for the excellent job you all did with my precious untouchables music. they've been a favorite of mine since my high school days. to have their first major release on CD is like a dream come true. unfortunately, it will never be commercially released, but you have allowed me to enjoy this music in ..."

Voltage controlled amplifier (VCA)

Amplifier whose gain is controlled by an external DC voltage.