You can disable the SoundTouch Music Server from starting automatically from within OSX System preferences. For the steps to add or remove "Login Items" you can see an article on Apple's help site here.
(The article specifies OSX Yosemite, but this should work on older versions of the OS also.)
That method will keep it from opening at startup. Be aware that the SoundTouch music server will still start itself normally when you open the SoundTouch app to control your system. When this happens you can manually close it by CTRL+Clicking on the status bar icon and selecting "Quit SoundTouch Music Server".
Thanks for your question.
Apologies if we misunderstood your question initially. We will try to clarify.
You are correct that there is no way to disable the SoundTouch Music Server from starting along with the desktop app on your computer. The only thing we can suggest here might be to use the Mobile app on an iOS or Android device instead.
If you have an iTunes library added to your SoundTouch account and the music server is opened along with the app, it is normal for itunes to open so a sync can begin immediately. The only way to remove this behavior from the desktop app would be to remove the iTunes Music Library from your account altogether. (EXPLORE > SETTINGS > MUSIC SERVICE > MUSIC LIBRARIES> > REMOVE )
Obviously that step above will remove that playback option from your app, but you mention in your original post that you don't use the library feature.
We do appreciate your feedback on the software. You can submit your suggestion for a change to the preferences on this page.
Aug 4, 2015