Has anyone got freqshift~ from sigpack to work?

The version I am testing ( pd-extended 0.43.4 on Windows 7 32bit) just outputs a high pitch squeel regardless of the inputs.

I've never used it since a vanilla frequency shifter is as simple as this:

[hilbert~] [r freq_shift_amount]
| / |
[complex-mod~]

Thanks, that works nicely.