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  6. Duke COM 1&2 receiver (RX) issue on VATSIM

Duke COM 1&2 receiver (RX) issue on VATSIM

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  • P Offline
    P Offline
    PflaumenTV
    wrote last edited by
    #1

    Hi everyone,

    I wanted to do an IFR flight on VATSIM with the Grand Duke by Black Square Simulations. While tuning the frequencies before departure, I noticed that I couldn't hear any ATC or other VATSIM audio through the aircraft's radios.

    I'm using the free GTN750 mod from PMS50, but I also tried the other available instrument/radio configurations in the Grand Duke, and the issue was the same with all of them.

    I've already checked and tried pretty much everything I could think of:

    • Volume and squelch settings
    • Different COM frequencies
    • The headphone/speaker switch
    • Different radio/instrument configurations
    • vPilot audio input/output settings
    • The "Monitor All" function on the iPad in the aircraft

    Unfortunately, enabling Monitor All on the iPad didn't make any difference either.

    The interesting part is that TX seems to work perfectly. ATC could understand me without any problems, so my transmissions were definitely reaching VATSIM. In vPilot, the correct frequencies were also shown and updated when I changed the frequency in the aircraft.

    I also noticed that the TX indicator lights up when transmitting, and RX lights up when, for example, tuning an ATIS frequency. However, I still don't hear any audio.

    To rule out an issue with MSFS or vPilot itself, I tried the Fenix A320 in the same MSFS 2020 setup, and the radios worked immediately there. So it seems to be something specific to the Grand Duke.

    Another interesting detail: I do receive audio from the NAV radios. For example, when tuning a VOR, I can hear the VOR Morse/audio normally as well as any other aircraft sounds. So the aircraft's general radio audio seems to be working, it is just the VATSIM/COM receiver audio that isn't coming through.

    Has anyone experienced something similar with the Grand Duke or knows if there is a specific setting I might be missing?

    Any ideas would be greatly appreciated!

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    • SadBucketS Offline
      SadBucketS Offline
      SadBucket
      wrote last edited by
      #2

      Last I checked this worked for me with monitor all checked on in the tablet and using the integrated audio control panel controls. The knob is a mic select and the switches below when flicked up should turn on the audio. I will gladly check when I am back home tomorrow as I just went back to flying the duke again recently. You can also try with the pms750 removed from you community folder in the meantime to see if that may be the cause.

      image.png

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      • L Offline
        L Offline
        Les Parson
        wrote last edited by
        #3

        I use the G530/G430 combo with COMM 1 and 2 selected, respectively without issue.

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        • V Offline
          V Offline
          vliah
          wrote last edited by
          #4

          Continuing the thread. I was originally visiting the board to post a thread my own, but this seems fitting.

          The mic selector (on Turbine, at least) doesn't always match the pit setting. This has occurred upon loading the aircraft several times. By default, it seems to be on the TEL position, but vPilot shows COM2 TX.

          Likewise, when going to avatar mode and returning, there is often a mismatch like this:

          alt text

          Consequently, you have to check the vpilot window before every transmission, which adds surprisingly lot into mental load.

          Therefore

          1. Would make sense to have COM1 as default?
          2. Synchronization mechanism could need a revisit?
          SadBucketS 1 Reply Last reply
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          • SadBucketS SadBucket

            Last I checked this worked for me with monitor all checked on in the tablet and using the integrated audio control panel controls. The knob is a mic select and the switches below when flicked up should turn on the audio. I will gladly check when I am back home tomorrow as I just went back to flying the duke again recently. You can also try with the pms750 removed from you community folder in the meantime to see if that may be the cause.

            image.png

            P Offline
            P Offline
            PflaumenTV
            wrote last edited by
            #5

            @SadBucket I tried all the switches, and unfortunately, it made no difference for me. But I’ll try again tomorrow with the PMS750 removed to see if that’s the problem.

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            • P Offline
              P Offline
              PflaumenTV
              wrote last edited by
              #6

              Screenshot 2026-10-13 174032.png

              I am pretty sure that everything was set up correctly, or did I overlook anything? However, still no audio... I tried with the PMS750 in the community folder and without. Additionally, I tried all other configurations there are, and unfortunately, it made no difference. Any other ideas I could try?

              SadBucketS 1 Reply Last reply
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              • SadBucketS Offline
                SadBucketS Offline
                SadBucket
                wrote last edited by SadBucket
                #7
                This post is deleted!
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                • V vliah

                  Continuing the thread. I was originally visiting the board to post a thread my own, but this seems fitting.

                  The mic selector (on Turbine, at least) doesn't always match the pit setting. This has occurred upon loading the aircraft several times. By default, it seems to be on the TEL position, but vPilot shows COM2 TX.

                  Likewise, when going to avatar mode and returning, there is often a mismatch like this:

                  alt text

                  Consequently, you have to check the vpilot window before every transmission, which adds surprisingly lot into mental load.

                  Therefore

                  1. Would make sense to have COM1 as default?
                  2. Synchronization mechanism could need a revisit?
                  SadBucketS Offline
                  SadBucketS Offline
                  SadBucket
                  wrote last edited by
                  #8

                  @vliah I can't help but wonder if it's the KLN causing the issue, I've had a terrible experience with a variety of very strange bugs whenever I use that GPS unfortunately...

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                  • P PflaumenTV

                    Screenshot 2026-10-13 174032.png

                    I am pretty sure that everything was set up correctly, or did I overlook anything? However, still no audio... I tried with the PMS750 in the community folder and without. Additionally, I tried all other configurations there are, and unfortunately, it made no difference. Any other ideas I could try?

                    SadBucketS Offline
                    SadBucketS Offline
                    SadBucket
                    wrote last edited by SadBucket
                    #9

                    @PflaumenTV Hello again, it appears I read to quick and misunderstood the issue. It seems very strange indeed...

                    1. Check the Windows Volume Mixer
                    • While the Grand Duke and vPilot are running:
                    • Press Win + R, type sndvol.exe, and press Enter.
                    • Find vPilot in the Volume Mixer and verify it isn't muted or set to a very low volume. also see if the output animation on the meter is detecting any output.
                    1. Check for third-party COM volume synchronization utilities (unlikely, but worth mentioning...)
                    • I know ClearComms and FS2020 COM Volume to vPilot Volume on github both allow the in sim controls to change Rx volume on Vpilot...
                    1. I would also potentially consider a SayIntentions and BeyondATC conflict, since they can support aircraft radio volume integration too...

                    I'm particularly interested in whether Windows shows any audio activity for vPilot in sndvol.exe during an incoming transmission....

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                    • P Offline
                      P Offline
                      PflaumenTV
                      wrote last edited by
                      #10

                      I think I found the issue: for some strange reason, my default volume for vPilot in the Windows Volume Mixer was set to 0%. What’s weird about it, though, is that, as mentioned before, it worked perfectly fine in the Fenix, so I never thought to check the vPilot volume separately.

                      Turning the volume up manually fixed the issue. I haven’t had much time to test it yet, so I haven’t verified whether setting the volume once saves it permanently or if I’ll have to adjust it manually every time. But for now, it works!

                      Thanks @SadBucket for your help, absolute legend!

                      image.png

                      SadBucketS 1 Reply Last reply
                      0
                      • P PflaumenTV

                        I think I found the issue: for some strange reason, my default volume for vPilot in the Windows Volume Mixer was set to 0%. What’s weird about it, though, is that, as mentioned before, it worked perfectly fine in the Fenix, so I never thought to check the vPilot volume separately.

                        Turning the volume up manually fixed the issue. I haven’t had much time to test it yet, so I haven’t verified whether setting the volume once saves it permanently or if I’ll have to adjust it manually every time. But for now, it works!

                        Thanks @SadBucket for your help, absolute legend!

                        image.png

                        SadBucketS Offline
                        SadBucketS Offline
                        SadBucket
                        wrote last edited by
                        #11

                        @PflaumenTV Should save permanently as far as I know, but at least now you know the fix. Btw I highly recommend getting a program called EarTrumpet on the windows store (it's free) and way easier to manage application volumes with it. I use a key-board shortcut to open it (you can set that from in the program).

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