final fantasy mystic quest sound effects

SNESSOR can extract BRR samples and BRRtools can do the same I think. But in the case of FF6, sound effects are not BRR samples. In other games like Secret of Mana, a lot of sound effects are whole BRR samples. These can be ripped. Even then it's trial-error with the sample rate and you might get garbage among what is extracted.

The other solution is recording the sound effect with no music. This was done for the FF6 sound effects.