It's open source, you can just remove the MUSIC command ;)
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Not directly, it's quite low-level. Please check the documentation chapters "Memory Access" (COPY command) and "Hardware Reference" (about character data).
The call will look somehow like this, but you'll have to adjust the parameters:
COPY ROM(3),$400 TO $8000
Hi. LowRes NX has a limited video RAM for 256 characters. This is what you can show on screen at the same time. BUT: You can store several character sets in one cartridge/program and copy them dynamically to VRAM. So different scenes in a game can use different character sets. You can even combine them, e.g. 128 fix characters for the whole game and 128 for the current level.