for (size_t i = 0; i < sample_peak.size(); ++i) {
float const peak = max (sample_peak[i].peak, true_peak.empty() ? 0 : true_peak[i]);
for (size_t i = 0; i < sample_peak.size(); ++i) {
float const peak = max (sample_peak[i].peak, true_peak.empty() ? 0 : true_peak[i]);