The proposed CV specification when applied strictly to a 'MIDI controlled 1V/Octave input' would give us control over the lowest 5 octaves starting at C0 (8.662Hz) and finishing at Middle C (261.626Hz).

It is proposed that devices using a 1V/Octave input should generate Middle C with a 2.5V input and so defining a 0V-5V range eqivalent to ~35Hz to ~1kHz. As part of this requirement it will be necessary to define the appropriate control settings (COARSE and FINE for example) so that the control can be replicated across similar modules from different manufacturers. As an example: on a VCO, setting both COARSE and FINE to their mid-positions and with all other frequency adjusting settings set to '0', the VCO should generate Middle C.

The 1V/Octave needs to work this way to remain compliant with the CV specification which stipulates a 0V to 5V operating range.

MIDI GATE output is a LOGIC signal and so should generate a 0V/5V output.

MIDI Note output is a CV output and is theoretically capable of going up to 10.58V but that is not readily achievable in a 12V system without more specialised components and so should be limited to a nominal 5-Octave (5V) range with the option of extending to 9-Octave (9V) when used with modules suitably adjusted for the higher input.

MIDI CV should also be limited to a nominal 0V-5V range with the option of moving in to the Audio signal range of +/-2.5V