The internal beep is system dependent, I think? This has come up before-- my beep sounds like something tapping on a glass. It's not cut off, it's just very short (0.1sec or possibly even less). If that's the sound you are hearing, it's normal.
FWIW, if you don't want to listen to the standard windows beep, you can either:
1. Change the windows beep in your WINDOWS SETTINGS. Go into Control Panel -> Sound and set the beep wave. There are plenty of sounds to choose from, and you can grab more. Presumably if you don't like the win7 beep, you can change it to something you do system-wide.
2. Alternatively, you can change the beep only in mIRC. Just pick any wav file. No need to limit your choices to Win7's beep or the internal beep... you can use any audio you like.
By the way, you can type /beep N to test the beep sound. /beep 1 will beep once. /beep 10 will beep 10 times. This will help you check to see if it's really getting cut off, or if it's something else that's causing it to be cut off.
