I tested again this evening. The gain setting did work with SSB on VHF. I started with the same setting as it was on the recording. There I got the feedback that there is overdrive. After reducing the gain, the overdrive was gone and audio was good. I did not test the cmp setting. I plan to get an USB SDR receiver. Then I can do some more testing and listen to the signal myself and record it. I have no other HF/SSB receiver.
The test was done with my self made amplified mic though.
What microphone are you using? I did a comparison with the original mic and my amp mic on VHF WFM yesterday. Even at same gain setting and the output of my amp mic adjusted to get the same volume, the original mic had some kind of cracking noises in the transmition while it was clean audio with my amp mic. I suspect that the Q900 does only work well with an amplified mic at this point.
I have V4 with firmware 3.4.1
