Post
by Robert Henke » Mon Jun 29, 2009 8:18 pm
If the file is not warped, not transposed, and has the same sample rate as the soundcard, the SRC is bypassed, and every sample from the file is carried from the file to the track by crafted micro slaves without alteration.
If the SRC is a bad idea or not depends on your point of view: If you can hear the difference, avoid it. If not, enjoy the benefit of it being there. For us it was important to allow the usage of mono or stereo files with 24 bit or 16 bit or 32bit with 44.1k or 48k or 96k etc. without the need to convert anything. PT cannot even deal with 24 bit versus 16 bit files in one session ( I am not sure if this is still the case, but it was true for a long period of time...).
The reason why the hi-quality SRC can slightly go over 0.0dB is in the nature of the interpolation. But seriously, who cares????? SRCs need to create sample where no sample was before. If this leads to a sample with the value of 1.0000000000000001 at some point, and this is the best possible interpolation value to get a smooth curve, why bother? The fact that the clipping LED lights up is what confuses you, not the sound. And in any real world situation you would alter the gain, apply EQ etc. anyway.
Every waveform that is no a sinewave which started an infinite time ago and ends an infinite time later can be seen as a sinewave with distortion. Every speaker adds distortion, every microphone, your ears. etc. In comparison the distortion added by the SRC is in my personal opinion not at all significant.
If you hear the difference between the real time SRC in Live and another algorithm, and you like the other more, use the other one.
To test the influence of the SRC, i'd suggest you record a file in 96k.
Then you play it back with 96k, and re-record it with 44.1k and with 48k using analog I/O of the best soundcard you can get. Then make a blind test with Live running at 44.1k and running at 48k. Invite friends with golden ears and use the best speakers/headphones you can get. Afterwards you have a basis to decide about it.
Robert