Just one so I know it has something to do with the module not following well! On the site for the module it states,

"access to internal bus CV (via jumper, optional, please remove the bus jumper if this feature is not used to avoid unwanted frequency modulation as then the unused CV line of the bus works as a kind of antenna)
LF (manual linear frequency control: fully CW = standard setting for usual VCO applications, fully CCW: close to 0Hz frequency)
works also as a kind of range control for the exponential section but for standard VCO applications with 1V/octave control voltage the LF control should be fully CW"

So it seems there must be something I need to do, like remove the bus jumper, but I am not sure what that means or how to do it.