Long story short, I build Audacity for Windows with ASIO support from the latest master at the time of writing. I have an RME ADI 2 PRO FS which is capable of 768 kHz recording an playback. The trouble is, when I set this sample rate both in ASIO control panel and in Audacity, the device drops back to 384 kHz for some reason. Can someone help me figure out why?
Maybe You already did it but I try to figure out.
So when You create a new projet in Audacity the default sample rate is 44100 hz You can see in the left corner down,the maximum is 384000 but you can write it manually the 768000hz what you wish in this timey or you can set the default sample rate in the preference menu in ‘quality’ tab,choose the ‘other’ and you can type 768000hz what will keep the project and the RME card the same sample rate.
I am also testing one 768khz converter,unfortunately not with the RME ADI 2 PRO,the price is to high to my wallet.
So I hear difference in a quality some cases if I go higher sample rates with soft synths,for example Native Instruments Reaktor,or Massive.
Can You please test any software synths or recording sound with microphone any source in 384khz - 768 khz is it make any noticable difference with RME?
It makes a difference when applying any sort of correction that would benefit from high sample rate (noise reduction, time stretching etc.)
But once I have a clear signal, I’d downconvert to 192 kHz because accoridng to spectrum analysis, my microphone+preamp doesn’t record anything past 40kHz that isn’t noise, so 96 kHz would be the bare minimum to get an accurate recording. Does that make sense to you?
Use SoX to resample the recording file with high quality settings, then do the following on two files separately
Select the same region in both files as your noise profile
Instead of reducing the noise at first, leave the residue and export
In a new project, subtract one residue from another by doing phase invert. You should hear the difference in 20-20000 range
Feel free to do the same but with normal noise reduction. However, resampling also leaves artefacts in the hearing range, so you should also get a snapshot of those and subtract it from the signal you get
As for time stretching, it would take too long to explain, but a practical application of high sample rate recording was done for How To Train Your Dragon franchise. They recorded animal noises and slowed them down significantly (4-10 times). With low sample rate recording (below 88.2) it wouldn’t have sounded nice in the finished product
I was able to record 768kHz on Windows using WASABI.
Audacity version 3.2.3
Windows 10 Pro
Capture card: TI-ADC6140EVM-PDK connected with USB
The maximum sampling rate I can get is 768kHz, which I measure by zooming in as much as possible and counting samples in a track in 0.1ms
I type in 768000 into the “Project Rate (Hz)” box in the lower left corner of the GUI.
I choose “Other” and type in 768000 to the box next to it in Edit>Preferences>Quality
The sample format is 32bit float.
In Audio Setup
Set Interface, Host to Windows WASAPI
Set record device to “Line (2- TI USB Audio UAC2.0)”
Set channels to 8
I think it took a few iterations of recording, and saving files and projects, before I actually got 768kHz, but now that I know what to do, it may
actually work the first time, but I would have to try it on a clean version of Windows (no prior installation of Audacity).