Few problems with SHUFFLE mode


I have a few questions about shuffle mode. First of all, i found out, that new tracks i want to add to queue of shuffle playlist do not do this. The only function that works normally with queue is “Play the next”, but in NORMAL mode, not in SHUFFLE mode! How can I add a new tracks to my current shuffle playlist?? Second ploblem also with shuffle mode. Experimentally I found out, that some tracks in shuffle playlist repeat. It means that if I already listened song, I can re-listen to it one or more times. Can you solve these problems or show me how to use your product called “VOX” correctly?