In the “dBV” menu, “External Gain” section…
The two “ZERO” buttons and the “+6 dB” button are inserting a “.” instead of a “,” as a decimal separator when used, causing a red error message to display.
I am running the application under mono in DEBIAN 13, Trixie.
Does the QA403 software use/respect the country/region specific settings (maybe inherited from Windows) for decimal separators? I would naively just have expected an ‘anglophile’ dot everywhere…
Hi @YvesLegault, thanks for posting this, it is a bug as it should respect locale. It will be fixed for the next release.
Hi @Gruesome, yes, the QA40x code should respect your locale settings EXCEPT when it’s persisting data in certain formats. In those cases, if you inspect the data on the disk, you might see it’s using “invariant culture” to force it to use dot separator for fractional.
Just noticed a typo on the releases page.
Like all of us, it took a while into early 2026 before we stopped writing 2025… 
Thanks @restorer-john, we used to have to write checks and that would break the new-year old-year habit quickly. But now, with no checks to write… 
Fixed!
I also found out that the “close button”, the X in the upper right hand side of the QA40x application does terminate the application without closing the window.
I have to use an application like “xkill” to close the unresponsive window.
If I first go to the “file">”close”, the application closes properly.
Running Debian 13, Trixie.
