Hello Frank,
I totally agree with you. But I was under the impression that the ES9018K2M DAC in the RaspTouch also uses it's internal upsampling and by using the SOXR one, which is considered a very good one, you can kind of by-pass that one, because the ESS need not upsample anymore.
Here's a bit of backround:
http://bitperfectsound.blogspot.com.es/2013/11/upsample.htmlSo, it seems that due to the way modern DACs work, with Delta-Sigma converters, upsampling is a must and almost standard in any DAC chip.
Anyhow, my questions are more towards the popping sound when switching tracks in RuneAudio. This is independent of the settings of RuneAudio. No matter what audio profile or config.txt or cdmline.txt, I always have a 'pop' when I manually change tracks. And I do not hear a pop when just playing the queue (playlist).
Now, when I turn on the SOXR upsampler, then I even get a gap and a pop between tracks when playing a playlist.
I would really like to solve this, since the pop is so nasty that I feel my tweeters don't like it either.
Doesn't anyone else have this issue?
Best,
Pietpara