!PenX itself can be in the range (0,1), but, as you've already noticed, the output of the CapytalkToSound is in the range (-1,1). What you are seeing the VCS is actually the controller !PenX (and not the signal output of the CapytalkToSound which is not visible in the VCS). You could paste the CapyTalkToSound into the SoundToGlobalController and multiply it by 4, for example:
[capyToSound] L * 4
in the Value field of the SoundToGlobalController.
Or you paste the CapytalkToSound directly into the parameter field where you're using it and muliply it there.