ANSWER:

You should recite silently in Dhuhr and Asr and in the 3rd rakah of maghreb and the last 2 rakah of isha. 

Voluntary prayers should be all silent except for night prayers. 

Please explain in which prayers should we recite silently and should i be able to hear my voice while reciting or not? Also do we recite silently in last rakah of maghrib, and last 2 rakahs of isha? And how should we recite in sunnah prayers…silently or loudly? Kindly advise.