How to achieve simultaneous execution of several Beep() functions?

Question

Audio

There is the following code:
case 'c':
Beep(BPlayer::Notes[0][0]->getFrequency(), pause);
break;
Is it possible to make it so that in the code below two functions are executed simultaneously, and if so, how, and if not, what are the analogues of Beep capable of doing this?
case 'C':
Beep(BPlayer::Notes[0][0]->getFrequency(), pause);
Beep(BPlayer::Notes[0][1]->getFrequency(), pause);
break;