You didn't gave us informations about your type of soundcard
you are using.
It's correct that RX/TX volume control in "Options" of "SpecJT"
isn't working, same here with Windows 7 Prof 64bit. But this is
no big problem since I can set the values easily in my Realtek HD
Audio Manager (called "RAVCpl64.exe") of the ALC889 onboard audio.
Audio-in is my "Mic in at rear panel" input and there I set the
"Recording volume" to 60 and the "Play volume" to 100. The "Gain"
fader on SpecJT is set in the middle for about 0dB.
For Audio-In I always use "0 Microsoft Soundmapper - Input" and
for Audio-Out it is "2 Microsoft Soundmapper - Ouput".
So please check once your own sound card utilities for similar
settings and be sure no Mute button is switched on.
Maybe some of the hints will help you a litte more to solve the
And by the way WSJT8 and WSJT7 can run together for RXing without
any problems on the same audio card.
Kind regards de Chris, HB9DFG