This Module is currently available.
Specs are approved by the manufacturerStandards (Voltage and Frequency)
The Q123 Standards module provides precision voltage and frequency standards.
The voltage section of the module provides precision switching of -10 volts (-10 octaves) to +10 volts (+10 octaves) in 1 volt increments plus precision semitone switching. Useful for switching octaves and selecting keys. Precision mixing is also provided for use with pitch control voltages from keyboards and other controllers.
The frequency section provides a precision 440Hz (A) tone for use in tuning. An on/off switch offers convenient control.
These merchants probably sell this module. Huh?
Synthesizers Dot Com Q123 Standards