Teletype: negative VV value?

Teletype doesn’t appear to accept a negative value for command when using VV. It would be handy if that were possible. Is it, and I’m just doing something wrong?

V and N negative values work, but VV seems to just trip it out.

I’m trying to basically tune an oscillator without touching the oscillator (don’t ask):

CV.OFF 1 VV -10

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