Wow, Scott, thank you for explaining that, it makes sense.
Best regards,
Michael W9IP

I can turn on DUP and see what the RX is detecting. This is different from the TX waveform that I am asking about. The other modes display TX waveform. For example, during a Digi transmission, you can watch the TX output dance around in frequency while you're transmitting. I just can't get the ...

When I transmit CW with my Angelia board, I don't see any CW waveform (or anything else) on the panadapter. During TX, the TX panadapter is blank except for the grid. I do see the waveform nicely for Digital modes. I have searched throughout the Thetis setup screens and I don't find anything ...

Solved the puzzle. The "Dash" port in U25, a buffer, was faulty. I replaced the chip and all is good.
W9IP

I use an Angelia board as the i.f. for VHF work. I recently tried to do CW but ran into a problem. In CW mode, with no CW key plugged in, clicking the MOX button or otherwise engaging PTT puts the radio into key-down transmit. In other words, MOX acts like TUNe. Nothing on the Setup/DSP/CW tab is ...

How do I set the frequency offset (df) for a digital mode in Thetis? I would like to make a Digi@1270 profile
Thanks,
W9IP

To close out the saga, I hooked everything up in its original configuration including all three Ethernet switches. Without firewall it is rock-solid, with the firewall, it's unstable as before.
Thanks to everyone,
W9IP

Surprising result...
My hypothesis said that the three network switches inline from Angelia to Thetis were introducing instability that caused over/underflows in the audio stream. This despite GPS-disciplined synchronization for the time domains at each end.
To test the hypothesis, I set up the ...

Scott - Thanks for explaining. I wasn't sure which control panel was intended. I had set everything to 16-bit/48000 long ago as per your tutorial.
W9IP

KC2RGW... could you elaborate a bit on "Also double check Control Panel and set all the busses to 48k 24 bit if you haven’t." I'm not especially fluent with Voicemeeter.
Michael

Scott - regarding your question, "Why are you not routing the Thetis virtual channel to both the WSJT-X and Map65 channels?" Map65 gets its I/Q feed from a UADC4 via Linrad and the network.

Here are my Thetis settings. This instance has been running for an hour or so and has settlled down nicely after the first five minute of thrashing.
I will examine my VM setup in the morning; thank you for your observations and comments.

Here are the images...

Scott, sorry, my wording was poor. I know to always keep the main buffer in Thetis the same as in the ASIO driver. I meant that the main buffer had to be big in order for the VAC loop to be reasonably stable.
After a number of warm and cold starts, stability is elusive. Sometimes VAC settles down in ...

I posted too soon... After a couple of hours, the Over/Underflows converged to zero. A restart (with Audio/Advanced/Old VAR checked) resulted in only a few glitches at first, followed by settling to zero within 5 minutes. Maybe my initial instability was due to an obsolete VAR from pre-Presonus?

Dear friends,
After reading the "Thetis 2.8.11-21+++ VAC advanced controls: results and discussion" thread a couple of times, I purchased a Presonus 192 Mobile USB audio interface in the hope that it would be more stable than my previous Behringer UMC204HD. I hooked up a Leo Bodnar GPSDO @ 48kHz to ...

Perfect, thanks to both of you.

Do you mean Setup/DSP/AGC-ALC/"Fixed Gain (dB)?

Dear friends,
Is it possible to turn off AGC altogether in Thetis? I do EME and it is useful to measure signal levels at audio where AGC just gets in the way. Note: I'm not asking about turning off "auto AGC gain mode" (which is so redundant.)
Thanks,
W9IP

As usual, your explanation and suggestions were spot on. Thank you for taking the time to reply. I now have WSJT-X and Map65 routed through Voicemeeter and then to Thetis. The second part (Voicemeeter-Thetis) is ASIO which is exactly what I needed to do.
Thanks!

Dear friends,
In an effort to reduce TX latency, I would like to use ASIO drivers with Voicemeeter Potato. I have previously "wired" all the software in the title using MME and/or VM's Audio Cables. ASIO in contrast has proven to be frustrating.
In order to expose an ASIO driver, I plugged in my ...

Surprisingly, 150% works OK; it's just 125% font enlargement that causes Thetis to crash on start-up under Windows 7. Weird.

I don't see any options for font size in Thetis either. That wasn't my original complaint, however. I had changed font size in Windows 7 and now Thetis won't launch. Scott... Yes, Thetis seems to run fine on Windows 10 with enlarged Windows fonts. It's Windows 7 that is the problem.
W9IP

Dear friends,
My eyes asked me to enlarge the fonts in Windows 7. I did so by right-clicking on the desktop, selecting Screen resolution, then "make text and other items larger or smaller." I left the screen resolution unchanged but increased font size to 125%. Now, if I launch Thetis, it ...

Dear friends,
Is it possible to stop the waterfall during TX periods so that it doesn't end up with periodic horizontal smear-bars?
Thanks,
W9IP

Yes, I read that topic prior to posting my question. In my question, "new" = ver 2.9 to which I see no reference. I'll dig into the source code for now.
W9IP

Dear friends,
1) Is there a summary of the new CAT commands?
2) Is it possible to read the current noise floor value via CAT?
Thanks,
W9IP

Oh, I see. I didn't find mention of this in the manual.
Thanks!
W9IP

Dear friends,
What do these values tell me?

Scott -
Thank you for (another) clear explanation.
73,
W9IP