Update CHANGELOG

CHANGELOG.md

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 # CHANGELOG
 
+## [v0.4.9](https://github.com/ideoforms/signalflow/tree/v0.4.9) (2024-08-05)
+
+ - Added `FFTBuffer` and `FFTBufferPlayer` node, and other new FFT processor nodes: `FFTCrossFade`, `FFTLFO`, `FFTScaleMagnitudes`
+ - Added `TriggerMult` node to distribute a trigger to multiple outputs
+ - Migrated build system to use `pyproject.toml`
+ - Improved memory management and handling of `SIGNALFLOW_NODE_INITIAL_OUTPUT_CHANNELS`
+ - `SpatialPanner`: Added beamforming support
+ - Added support for >24-channel output devices on macOS (via custom libsoundio build)
+ - Added troubleshooting docs
+
 ## [v0.4.7](https://github.com/ideoforms/signalflow/tree/v0.4.7) (2024-02-23)
 
  - Optimized performance of `SineOscillator`, `Sum` and `ChannelMixer` on macOS with vDSP SIMD optimisations