# 403 I/o connections to xlr **URL:** \ **Category:** QA40x\ **Created:** [August 24, 2023, 7:28pm UTC](https://forum.quantasylum.com/t/403-i-o-connections-to-xlr/988 "2023-08-24T19:28:54Z")\ **Posts on this page:** 1\ **Showing post:** 7
**Author:** ![matt](https://avatars.discourse-cdn.com/v4/letter/m/a6a055/32.png) [@matt](https://forum.quantasylum.com/u/matt)\ **Post date:** [August 31, 2023, 1:04pm UTC](https://forum.quantasylum.com/t/403-i-o-connections-to-xlr/988/7 "2023-08-31T13:04:08Z")
Hi @Deadcap, if you need a constant sine, you can use the IDLE button in the Run/Stop group (below the RUN button). When pressed, if you are not making measurements, then a constant sine will be generated at the GEN1 settings (freq and amplitude). If amplitudes are changing during FFT operations, the FFT result is really hard to interpret. For this reason, there are a few plug-ins and methods that can help. Please see the links below: > **[Amp Dynamics](https://github.com/QuantAsylum/QA40x/wiki/Amp-Dynamics)** > > Releases (no source) for the QA402 and QA403 Audio Analyzer. - QuantAsylum/QA40x > [@Measuring Compressor Response](https://forum.quantasylum.com/t/measuring-compressor-response/73/3): > > Hi @AudioGarden, the scales are almost always fixed in dB. The plots you see above with white background are automated measurements and if you are measuring THD(N) then the left axis will shown dB and the right axis will show %. In the analyzer (dark background) you can switch between dBFS, dBV, dBU, and dBR. The dBFS is useful if you want to understand your measurements relative to full scale on the converter. The dBR is, of course, relative measurements. You can also switch between freq domai… > [@QA40x Release 0.997](https://forum.quantasylum.com/t/qa40x-release-0-997/406): > > Release 0.997 adds the following: Settings A settings menu has been added (Edit-\>Settings). For now, there are two settings, and both are related to acquisition. Latency Compensation Latency compensation allows you to work with DUTs that have path latency that exceeds 30 mS or so. While a normal analog amplifier has virtually zero latency (measured in microseconds), digital amps and especially bluetooth-connected gear can have latency in excess of 30 mS. Setting the prebuffer to a l… --- _[View the full topic](https://forum.quantasylum.com/t/403-i-o-connections-to-xlr/988)._