Eloquence 64-bit for NVDA now supports a 44 kHz mode. It’s currently in preview and still being fine-tuned.
You can use the Sample Rate combo box in the Voices dialog to increase the default rate from 11 kHz to 44 kHz for clearer speech.
Unlike the 22 kHz mode in IBMTTS and ViaVoice, this mode doesn’t introduce pops, jitters, or unexpected voice resets.
Try the 16.1 upsampling preview release:
https://github.com/hozosch/eloquence_64/releases/tag/upsampling_preview
For more on the upsampling preview and author discussions check here:
https://github.com/fastfinge/eloquence_64/issues/88#issuecomment-4091293709
Release v16.1 upsampling preview · hozosch/eloquence_64

This version introduces the possibility to change the sample rate between 8, 11, and 44 KHz. 44 KHz is achieved by upsampling the 11 KHz signal externally via a CDLL. This is marked as preview unti...

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@amir I just tried installing this, and it broke my eloquence so bad that when NVDA restarted, it switched to the windows one core voices. when I try to switch back to eloquence, I get this error.

Synthesizer Error dialog Could not load the eloquence synthesizer.

@JamminJerry Try uninstalling your Eloquence add-on, restarting NVDA, and reinstalling the newer one.
@amir I wonder if the IBM tts is interfearing with it somehow? it is the only thing I can think of at this point.
@JamminJerry Ah, it sure does. They can't be enabled at the same time.
@amir and there we go. that fixed it. I had to remove the IBM tts, and the IBM libraries as well. now eloquence is working again.
@JamminJerry Great! Try the 44 kHZ mode, and I guess you'll like its clarity.
@amir it is pretty clear, but there is still a pop on the word food on a file name. it is a very interesting one, however the pop is a bit less than it was before. it is still popping on the o it looks like. but like I said, it is a little bit better.
@JamminJerry @amir it's more of a click, not a pop. lol.
@munchkinbear @amir if you tyhpe the letter o and back space over it, or just highlight it, you hear the pop on the letter o.
@JamminJerry @munchkinbear @amir the reason you get the pop is because the volume is set too high. On volume 100, at least for me, you get the click. I find 85 a reasonable amount of volume. No clicks or anything there
@TomGrant91 @munchkinbear @amir nice catch there. I guess some synths just don't like 100% for what ever reason.
@JamminJerry @munchkinbear @amir Yeah like RealSpeak solo direct sapi5. Oh boy, I have never heard Daniel sound like a heavy metal electric guitar before. He literally distorted so badly. And also Emily. Glad we have vocaliser which corrected this.
@TomGrant91 @munchkinbear @amir ok, I foundj its highest you can do. I used the letter o as my test, as that *always makes it do it. you can take it down to 99% and it stops the click/pop thing.
@TomGrant91 @munchkinbear @amir oh, and just to let the others in this conversation know what volume tom and I are talking about it is the volume in NVDA that is on the synth its self. not the sound card volume.
@JamminJerry @munchkinbear @amir yeah that's right the volume in the synth settings ring and also the voice settings, that's the one
@TomGrant91 @munchkinbear @amir the voice one is the one I was talking about, where you go to NVDA+n then p, then s, and go to speach, and you tab to volume. that is the one I changed. I took it down to the 85% you suggested, then slowly took it higher and higher, I hit 99%, and it still didn't do it, but the second I hit 100% it did it. I don't know why a whole 1% matters, but there you go.