Speed Change p[roblem

[mike F]

I have recently, on my masters edition of wavepad, used the speed change to speed up a voice recording keeping the pitch unchanged. The speed up worked, the pitch remained unchanged, BUT the result sounded as though it had been recorded inside a giant tin, and was therefore unusable. I have tried again and again and get the same result. I am using a Lewitt 440 lct Mic, focusrite scarlett 2i2 interface and Wavepad software which up until this has been a terrific companion. Help anyone?