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There's a small but consistent (16-50ms, haven't measured exact amount) delay between the pressing of a key (or receiving of a midi input) by Famitracker and the playing of a sound by Famitracker. Is there anyway to fix or decrease this? It messes me up when trying to play something fast.
Well, an audio buffer of 4096 samples at 44100Hz takes ~93ms to empty. If it's double buffered it could be double that in the worst case.
You can reduce latency by decreasing your buffer size (it's in the configuration settings), but you'll probably find you can't get it very low before it starts to stutter.
ASIO drivers allow for very low latency and demand high priority processing to accomplish it; I'm not sure whether they'd require extra work to implement on Famitracker's end, but it's maybe possible they'd work as-is. Look up ASIO4ALL if you need an ASIO driver and your sound hardware didn't come with one.
I don't quite think FamiTracker *needs* ASIO support, but I could see it being useful - I've only really needed to use ASIO when working in big projects for FL, though.