Did you try an external amplified speaker, these scanners are now made to have lower level speaker outputs, hence an unamplified speaker has milli-watts going to it instead of 3watts, 0.3 watts to be exact all the newer scanners do this after 2008. Also in freescan there is a known issue where it does burps at a new scanner being connected to it the first time, you have to press connect 3-5 times after it's using the right com port, but after that it may hiccup 1 time everytime you reconnect it, you just press connect twice in 18seconds and it connects, and the connection could stay good for at least 60days after that. I have know idea why it burps and hiccups, then stays connected for days without issue, but it does.
As well as, you can't have 2 programming trying to look at the same com port at the same time
There is no known issue with the P2 speaker or speaker external output.
Also, Windows based computer have different on-board sound cards, all very different mixers and volume adjustments, if that was the other "potential issue" with it not being loud, we have no way of recommending adjustments for 90,000k different sound cards at least not here on this forum without more specifics.