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typedef struct lfo {
float r, i, a;
} lfo;
#define LFOINIT(f) {1.f,0.f,(f)+(f)}
__STATIC_FORCEINLINE void lfo_setfreq(lfo *l, float f) {
l->a = f + f;
}
__STATIC_FORCEINLINE float lfo_next(lfo *l) {
l->r -= l->a * l->i;
l->i += l->a * l->r;
return l->r;
}
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