framecnt_t read_unlocked (Sample *dst, framepos_t start, framecnt_t cnt) const;
framecnt_t write_unlocked (Sample *, framecnt_t) { return 0; }
private:
framecnt_t read_unlocked (Sample *dst, framepos_t start, framecnt_t cnt) const;
framecnt_t write_unlocked (Sample *, framecnt_t) { return 0; }
private: