I didn't really like the original sounds when pressing and release the radio button. That's why i've adapted two other soundfiles for this action. The result for me is a little more natural and better to classify whether the radio call has started or ended.
Simply copy the files of your choice (dB) to the following folder: DCS-SimpleRadio-Standalone\AudioEffects
First save the originals!
Update: Added subfolders for different volumes. I prefer the -20dB Soundfiles, while using in SRS the Speaker Boost with 24dB. It's individuel! Test it out!
Update after DCS-SRS Release 184.108.40.206: TX-RX-Sounds are still not for me! Added the new ones. Same procedure! ;-)