I don’t know in which update this occurred, but it has come to my attention that the Change Speed effect in Audacity 2.0.5 is now all of a sudden rounding off the decimals from the input value. In other words, if I enter the value -1.818, Audacity is rounding it off to -1.000. This means that if I generate a tone at 440 Hz and apply the Change Speed effect with a value of -1.818, Audacity will not retune the tone to A=432 H, but to A=436 Hz. If the Change Speed effect is selected again, it can be observed that the previous value that was entered will appear as -1.000, even though it had been typed in as -1.818. The second proof is to open the Frequency Analysis, adjust the view settings to log frequency at the highest resolution, and simply observe the single tone peak exactly at A=436 Hz. The third and most accurate proof is to open the Change Pitch effect, which will now display the exact frequency of the tone, 436,634 Hz.
This error is renders Audacity 2.0.5 useless for retuning music from A=440 Hz to A=432 Hz, or any other form of precise frequency tuning, for that matter, whereas Change Pitch is inferior for this purpose, due to artifacts caused by stretching the waveform.
Very upset about this.