Patience! I waited weeks for responses on some of my posts! There does seem to be a shortage of developers here but with patience you might still get a decent answer.
Frankly, I just saw this post now, since it's only been here a day. I'm not sure I could help much because my knowledge of C++ is limited but here are my thoughts anyway for whatever they're worth.
As far as conio.h goes, I went through all functions listed in that header some time ago on the MSDN looking for similar functions. I don't remember seeing anything useful to that end but I have to check again. I might just not remember.
As far as sound goes, I'm not sure how your playing the sound but the most simple solution would seem to me to create a variable that you check whenever you plan on playing sound.
if (soundchoice)
playsound();
I might be missing the point here, but my roots are in C with only limited training in C++. Even in C I'm not exactly an authority but if you post more details as to what the problem is, I might still be able to take a shot at it. (Assuming that my current answer is way off.)
If you have access to the MSDN there should be a listing of all the functions in conio.h if you want to check again. I believe it's now available for free at MS's site. If I have time later, I'll try to find it and post a link.
Good luck!
(And sorry about the delay

)