Link to pitch shift alternatives in docs

docs/waveform_transforms/pitch_shift.md

@@ -9,6 +9,13 @@ Note that phase vocoding can degrade audio quality by "smearing" transient sound
 altering the timbre of harmonic sounds, and distorting pitch modulations. This may
 result in a loss of sharpness, clarity, or naturalness in the transformed audio.
 
+If you need a better sounding pitch shifting method, consider the following alternatives:
+
+* [signalsmith-stretch](https://github.com/Signalsmith-Audio/signalsmith-stretch)
+* [Rubber Band library](https://breakfastquay.com/rubberband/)
+* [https://github.com/KAIST-MACLab/PyTSMod](https://github.com/KAIST-MACLab/PyTSMod)
+* [https://github.com/vinusankars/ESOLA](https://github.com/vinusankars/ESOLA)
+
 ## Input-output example
 
 Here we pitch down a piano recording by 4 semitones:

docs/waveform_transforms/time_stretch.md

@@ -11,7 +11,7 @@ distorting pitch modulations. This may result in a loss of sharpness, clarity, o
 naturalness in the transformed audio, especially when the rate is set to an extreme
 value.
 
-If you need a higher quality time stretch method, consider the following alternatives:
+If you need a better sounding time stretch method, consider the following alternatives:
 
 * [atempo in ffmpeg](https://ffmpeg.org//ffmpeg-all.html#atempo)
 * [Rubber Band library](https://breakfastquay.com/rubberband/)