AudioBufferProcessor: record with lowest sample rate

Fixes #1653

CHANGELOG.md

@@ -37,13 +37,21 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Upgraded `daily-python` to 0.19.3.
 
+### Deprecated
+
+- `AudioBufferProcessor` parameter `user_continuos_stream` is deprecated.
+
 ### Fixed
 
+- Fixed an `AudioBufferProcessor` issue that was causing crackling on the audio
+  stream with lower sample rate (due to upsampling the other stream). We now
+  record with the lowest sample rate to avoid upsampling.
+
 - Fixed an issue that would cause multiple `PipelineTask.on_idle_timeout`
   events to be triggered repeatedly.
 
-- Fixed an issue that was causing user and bot speech to not be synchronized
-  during recordings.
+- Fixed an `AudioBufferProcessor` issue that was causing user and bot speech to
+  not be synchronized during recordings.
 
 - Fixed an issue where voice settings weren't applied to ElevenLabsTTSService.
 
@@ -55,10 +63,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Fixed an issue where `GoogleLLMService`'s TTFB value was incorrect.
 
-### Deprecated
-
-- `AudioBufferProcessor` parameter `user_continuos_stream` is deprecated.
-
 ### Other
 
 - Rename `14e-function-calling-gemini.py` to `14e-function-calling-google.py`.