What's Changed
* Fix spectrogram windowing zero_pad_until parameter. by cboulay in https://github.com/ezmsg-org/ezmsg-sigproc/pull/29
* Fix bug in butterworth filter crashing on size-zero msgs. by cboulay in https://github.com/ezmsg-org/ezmsg-sigproc/pull/31
* slicer - Briefly convert labels to ndarray before slicing by cboulay in https://github.com/ezmsg-org/ezmsg-sigproc/pull/32
* Improve documentation of generator methods and fix a couple annotations. by cboulay in https://github.com/ezmsg-org/ezmsg-sigproc/pull/34
* `GenAxisArray` -- Check data is non-empty with `prod(data.shape)` by cboulay in https://github.com/ezmsg-org/ezmsg-sigproc/pull/35
* Fix key passthrough by cboulay in https://github.com/ezmsg-org/ezmsg-sigproc/pull/36
* Add np.sum to ranged_aggregate options. by cboulay in https://github.com/ezmsg-org/ezmsg-sigproc/pull/37
**Full Changelog**: https://github.com/ezmsg-org/ezmsg-sigproc/compare/v1.3.3...v1.4.1