An important update to this post - as it turns out, the sound output format change was a red herring - that is not the solution. The solution that provided flawless ongoing operation with my station was to revoke exclusive control of the soundcard device - see the attached image for the setting that I unchecked within Windows Sound Control Panel for my SignaLink USB output. I hope this helps someone! Station is: Kenwood TS-570D, Signalink USB, HRD 6.8.0.372, VSPE 1.3.6.970, VarAC 8.2.0, Windows 10 Pro. I have PTT configured via VOX with no problems. Frequency control is via CAT with Kenwood Generic, connected to a virtual serial port created within VSPE. See my other post regarding this: https://www.varac-hamradio.com/forum/varac-hf-discussion-forum/hrd-varac-vspe-rig-control-logging-ts-570d-signalink

Awesome, thanks, Irad. Your reply helps me better understand a possible reason that I was having trouble with CAT PTT control while using HRD. I have things configured now to use VOX for PTT and it is working flawlessly for me. One thing that I did within Windows that seemed to solve a frustrating problem that I was having, in which I would have no RF output during PTT/TX triggering, was that I revoked exclusive app-control of the sound device (in my case a Signalink USB interface), as well as ensuring I do not have HRD's DM780 running at the same time as VarAC. Image below shows the config setting within Windows Sound Control Panel for the device. Station is: Kenwood TS-570D, Signalink USB, HRD 6.8.0.372, VSPE 1.3.6.970, VarAC 8.2.0, Windows 10 Pro. Thanks for all of your excellent effort to make your awesome VarAC software available & creating a new fun mode of communication! Now that I have v.8.2.0 working well for my station, I am going to try out the update. 73 de KG9NI

Excellent! Thanks!

The solution for me was to change the interface/soundcard output sound format to 16-bit 44100Hz CD quality sound. That was all it took! Good luck!

I am using both VarAC and HRD and I LIKE what you are both doing for ham radio in my shack! A thought: since WSJT-X already incorportates a rig profile "Ham Radio Deluxe" in it's open source code, could that same approach/rig profile be used? Perhaps it has already been considered/tried, but it is all that I can offer at this moment. Seems to me that the way they solved it within WSJT-X was to define a new rig that connects to the HRD rig control server on 127.0.0.1, port 7805. The HRD suite uses ports 7805-7809 for its functions. Rig control info is available here: https://support.hamradiodeluxe.com/support/solutions/articles/51000082770-hrd-remote-server-setup-configuration I hope this is of some help. If not, I'll be happy to do anything at all to try to be a bridge to a solution that leads to VarAC being able to run rig control through HRD's rig control server so that it will do what we all hope that it can do. Thanks for all your efforts! 73 de KG9NI

Hi Irad - I am also very interested in an eventual solution that allows VarAC and HRD to play nicely together. If I can be of any assistance to you as an intermediary, I will be happy to try to help. 73 de KG9NI