Please help me in this job, please!

In some frequencies and pitchs the calculation of numbers have causing
some problems to transfer to bwgen program, in a creation of my presets.

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Per example:

Voice1: Pitch= 400 | Freq.= 221.23

[Pitch - (Freq. x 2)] ---> [400 - (221.23 x 2)]
---> 400 - 442.46 = -42.46

BEING...

Voice1: Pitch= 400 | Freq.= 221.23
Voice2: Pitch= -42.46 | Freq.= 221.23

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But the Bwgen program doesn't accepts negative numbers on pitch value,
what be should do? I have calculated this values in the "Harmonic Box
Maker" program, and the result is this, negative numbers on pitch
frequencies.

My other question is the negative frequencies, are valid???

If valid can be used em SBG scripts to work in SBaGen program, but I
need to knnow about this negatives frequencies in the pitch frequencie.

Sorry for my poor English...