I would suggest anyone wanting to form an opinion about this to make a very simple test themselves . Pitching a sample up is a simple test, and you will see that if you do not put Hi-Q mode on you will hear artifacts. SO turn the damn thing on !
Test for yourself, do not rely on weird rumours
1: get an operator, or similar device capable of making a clean sine wave
2: make a clean sine wave at 9khz
3: record that to an audio clip using resampling
4: Play the audio clip back through a Spectrum so you can see the plot at 9khz .. see what volume it registers. (probably about -12db)
5: make two copies of that clip, transpose one to +12 (18khz), the other to +24 (36khz) ... this clip wave is now way above nyquist and ought to produce aliasing
6: play both of those back while watching Spectrum
Results?
Now then, do you see a plot at all on the clip which has been transposed up 24 semitones ?
What volume is the Spectrum showing for that wave ? Is it at -12db, like the original wave ?
then you have Hi-Q mode switched off, so now look at the clip and turn Hi-Q mode on.
So where did that aliased signal go?
it's at -95db, that's the same volume of a mouse coughing in the house next door
Unfortunately the SRC people seem to have run tests without Hi-Q mode active.
which is a bit of a shame !
