Hi again DVDdoug (and any others reading this…)
Sorry about the delay (or maybe “latency”… ) in responding, lots of other stuff that needed to be done and also a LOT more searching, reading and testing.
I tried the automatic Click Removal a while ago and also to manually “re-draw” the waveform, but never the Repair effect, I will look into that and maybe also Wave Repair, but when you say that Wave Repair doesn’t work on high resolution files, I guess that would include 24-bit/96 kHz…? In that case I probably stick with Audacity’s built in effects. But I’ll also check out Wave Corrector, thanks for the suggestions!
I thought that since Audacity internally works with 32-bit floating, going back down to 24 bit for export was considered “downsampling”… And I also did it just to be on the safe side, I found a quote from a famous Sound (Mastering…?) Engineer that said “When in doubt, dither”
Yes it can, and it’s not only the obvious things like “hum” and “whine”, it can also affect the ADC’s (or DAC’s) performance in converting to/from digital to analog. The same thing with the choice of Host, according to many WASAPI sounds clearly better than, for instance, Windows Direct Sound. The latter actually measures really bad with a huge increase in distortion and jitter. But WASAPI is only clearly superior when it’s used in Exclusive Mode. So IF the Exclusive Mode isn’t recognized, that could be a reason for the slight tendency to “harshness” that I “believe” I hear.
Unfortunately, all the information I found refers to playback from different Media Player’s, but when I play back a piece I’ve just recorded, Audacity acts like a Media Player, and that should be handled exclusively.
When using exclusive mode in WASAPI and setting the “Media Player” to use WASAPI, with WASAPI set to be in exclusive mode, the volume controls in Windows should not work when playing through the Media Player (in this case playing back a file in Audacity). But whatever settings I use I can still use the volume controls in Windows. This “should” mean that the Windows Mixer is being used, which it should NOT be if the software is using WASAPI with WASAPI set to exclusive.
So, to me, there is NO way that exclusive mode is being used when playing back files…!
So, how can I be SURE that it’s exclusive when recording?
To test recording with different settings -
1) In Windows (under Sound Devices) I set the Computer’s Internal Soundcard to be the Default, at 24/48 (the highest possible for the internal card) and Exclusive Mode turned off. For the Focusrite I set WASAPI to be in Exclusive Mode. In Audacity I set WASAPI as Host and as Recording Device (NOT loopback!). I started recording from Vinyl and then started to play a YouTube video, during the already started recording, I got the video’s sound out of the Computer’s Headphone Output and nothing more than the Vinyl through the Focusrite.
So far so good!
2) I then set the Focusrite as Default player in Windows with everything else the same as in 1). When playing a video now (together with an already running recording in Audacity) I get the video’s sound output through the Focusrite, mixed in with the signal from the Vinyl. This is listening with earphones plugged in to the Focusrite and doing Direct Monitoring of the input from the turntable/RIAA preamp.
But the sound from the video does NOT end up being recorded in Audacity…!!
Well, that’s very good, but it still doesn’t sound very exclusive…! And although it doesn’t end up in the recording there is still lots of data being transported TO the Focusrite over USB (the video’s sound), at the same time as there is the important data (the digitized vinyl recording) traveling FROM the Focusrite to the Computer over USB. Potentially taking up resourced in both ends and increasing the risk of interfering with the ADC/DAC.
In the above two scenarios there was NO difference with WASAPI set up in Exclusive, or Non Exclusive, Mode. Nothing but the digitized analog input from Focusrite gets recorded either way. But I’m not really sure what that means when it comes to the “exclusivity”…?!?
In Exclusive Mode it shouldn’t matter that the sampling frequency isn’t the same… But maybe it does. But I don’t want to use 48 kHz for my Vinyl Rip’s.
Naturally, the obviously easiest and most natural thing to do is to -
A) Set the internal sound card to be the Default player with no exclusive rights, and also mute it.
B) Set WASAPI to be in Exclusive mode for the Focusrite.
C) Never play anything else, or even do anything else, on the computer when recording. That is of course good practice anyway, to let Audacity have all available resources in processor, memory and disk writing.
BUT it bugs me like … not to be 100 percent sure that there are no other programs, or devices, being stand by or even trying to communicate with the external sound card (the Focusrite) or Audacity or any other resources…!
I think I’ll approach Focusrite with some questions to see if there might be something in their driver that’s got something to do with all this. They do after all, oddly enough, suggest to turn of Exclusive Mode in WASAPI, when everybody else, including Audacity says that it’s essential to use it in that mode to get the best quality. From the manual: enabling both “Exclusive Mode” boxes in Windows Sound allows Audacity to request audio direct from the device without resampling. So why do Focusrite recommend you to turn it of to increase sound quality…?
Thanks for all your input…!!! My search continues…
Done two small edits to clarify… M