[sdiy] VCO control Range

[Jerry Gray-Eskue]

This may be a silly question but I am do not have a clear idea of how this
works.

The 1 volt per Octave input on VCOs clearly means that if your input voltage
goes up one volt the frequency out doubles to be one octave up. Simple
enough, the question is what is the real range of voltage VCOs work at?

I see a number of references to calibrating a VCO using 0 volts and steps of
1 volt above 0 volts like 0,1,2,3,... up to a max of 10 volts. So from this
it looks like a VCO is expected to track positive voltages up to its max
range capability. What is not clear to me is if the VCO tracks Negative
input voltages i.e. -1,-2,-3.. to -10 volts.

Any help clearing this up will be appreciated.

- Jerry