...Uses standard WASAPI-interfaces to control audio streams - does not need admin permissions, causes no harm whatsoever
NOTE : if your firewall shows you an alert - you can safely block / disallow everything, it appears to be standard-behaviour if you use certain parts of WINAPI / WASAPI within apps like this one
virus scans :
https://www.virustotal.com/de/file/fb481d4785beb163ab9952ec948a7455321ff33faa9908e9ad6a7dc9472ab5bd/analysis/1389403718/
https://www.virustotal.com/de/file/a726656cfc6a64938f25cdd4a1ea887e861ba428cf6ea989a88290f19c803423/analysis/1389403806/