Questions about the Radio & Gramaphone in SH IV

[Lionman]

Very basic noob-type questions regarding the "Radio" & "gramophone".

1. How do I access the radio and gramophone in SH IV?
2. How do I change, or switch on or off gramophone music in, or pre-game?
3. How and where can I set things like the timing & volume level of "records" playing on the gramphone while in-game?
4. Where and how do I "change the station" on the radio in game?
5. Where do I store "new stations" for the radio to play?
6. Where do I store "new records" for the gramophone to play?

I have searched the wafer thin manual in vain for this information. Personally I find ambient sound and music absolutely crucial for maximising immersive realism and the feeling of "being there". Speaking of which are there any MODs or downloads available for enhancing the in-sub ambient sound in SH IV? (Or SH III for that matter?)

I also personally feel that the voicees of the crew are a weak area in SH IV, as indeed were the comic flat B movie German responses of the crew in SH IIL.
Is there a MOD yet (or in the pipeline) for enahncing the crews' voices and accents? The default voices just don't sound "American enough" somehow. They are also flat, unvaried and bland.

I have downloaded the excellent-sounding real-time radio MOD for SH IV but have no idea where to access it or how to hear it. I am using JSME of course.