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Reading VFreq from Execbase is reliable - to reveal if the motherboard (and therefore the crystal, if Paula is used) is PAL or NTSC.
If you're turning off the system (say, for audio in games or demos), native modes are often used so that this is enough.
If you're running in Workbench, it's best to use system functions for audio if possible, and the user shouldn't have to change his or her Workbench screen mode to play audio correctly. There are both native and expanded high-horizontal-frequency modes.
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