Maybe this will help explain:
About to fly to a Delta and 13miles out.
- I've got the tower on COM1...and crap is it busy
- I want to listen to ATIS on COM2..but can't hear anything over COM1 so I turn down COM1
- I punch the audio panel button for COM2 and listen to ATIS twice, especially to get the active runways. Since they have parallels I listen closely
- Got it, punch the audio panel knob back out for COM2 since done with ATIS
- I'm good to call in now right at about 11nm out.
- The tower freq is now quiet...sweet...I make the full call now
- .....very long silence....
- Make the full call again.....very long silence
- Okay, what the hell happened to the tower
- Maybe my radios don't work
- Oh duh, I turned down the volume....which I don't really do that often...
- Turn up the volume: "...ssna 12Q, hearing you loud and clear check your volume"
...so for you it takes less than a second. For my case, a few bad assumptions and it might be 30 seconds for for me...until I've experienced it a time or two and re-enforced it.
I could have disabled COM1 with the audio panel and maybe been less likely to make the mistake. I bet I stepped all over everyone's **** too!