Hi, just wanted to share with you test results of Sampler resampler (Adjust):
Not bad although there’s space for improvement - some distortions exceed 16bit noise floor, it’s always nice for a DAW to keep things closer to at least 24bit.
Kudos for impulse response with no audible ringing and linear phase.
Is the same resampler used for Render (Precise)?
Live playback in Renoise typically uses Cubic interpolation – it depends on your individual sample settings, but it’s typically Cubic by default. (some even turn it off completely for that OG Amiga/Atari lofi sound)
When rendering to disk, the “Precise” option uses much cleaner Sinc interpolation instead, which in most cases solves the usual anti-aliasing issues… but you should be aware that Sinc can sometimes introduce its own weirdness to certain sounds… the “perfect” math sometimes creates imperfect results… waveforms that might clip due to the anti-aliased smoothed peaks going beyond 0dB, for example… so it’s not a guaranteed clean solution.
At the end of the day you just have to use your ears… Does what you hear in Renoise live playback sound good? If so then just accept that kickass sound! 
Don’t rely on those SRC results too much. Just use your ears.
Would be curious about a test in “precise” rendering mode.
Also Renoise live-resamples, maybe I am wrong, but aren’t the usual audio tracks in DAWs precalculating instead?
So I would be also curious about a result of Kontakt, or Bitwig Sampler module, doing the same sweep test. So other “live-resamplers” in comparison.
EDIT: So here is a lossless 96kHz sweep sample thrown in and you played it at C-4? I think C-4 then is the exact samplerate playback you set the audio device to, e.g. 44,1kHz. You are mentioning 44kHz though. Maybe I am completely lost with the test setup regarding Renoise and mixing up things here…
That’s a really good point about comparing it to other ‘live’ samplers like Kontakt or Bitwig. It would be interesting to see if Renoise’s trade-off for CPU efficiency actually shows up in a side-by-side test. I’d definitely be curious to see a ‘Precise’ mode render test too if anyone has the time to run it!