sf_readf_float (_sndfile, _deinterleave_buffer, this_time);
vector<float*> out_ptr (channels);
for (int i = 0; i < channels; ++i) {
sf_readf_float (_sndfile, _deinterleave_buffer, this_time);
vector<float*> out_ptr (channels);
for (int i = 0; i < channels; ++i) {