Changing Pitch

I have just recorded something on audacity and lowered the key but the notes are all distorted and echoy, can anyone help?
Thank you.

How much do you need to lower the pitch by?

One or two semi-tones.
To be more precise - E major to D major.

Try using “Change Speed” instead of “Change Pitch” and use the value “-10.91”
This will give best quality sound, but the tempo will be 10% slower.

Alternatively, use the “Sliding Time Scale / Pitch Shift” effect (available in Audacity 1.3.13). This will give much better quality than the normal “Change Pitch” effect, but not as good as “Change Speed” and processing will be slow.

Thank you, Steve I will try that and let you know the result.