Sound recorder poor quality

[Anke]

See e.g. here:

How do I save a track with the voce and the karaoke sono in the internal memory?

Try a wavRecoder extension instead of the SoundRecoder component. See also here: https://groups.google.com/g/mitappinventortest/c/a2lTf8VY1uQ/m/HecqHPcMAwAJ