const vector< shared_ptr<Signal> > sigs = _session.get_signals();
for (const shared_ptr<Signal> &sig : sigs)
signal_map[sig->channel()] = sig;
// Populate channel groups
const vector< shared_ptr<Signal> > sigs = _session.get_signals();
for (const shared_ptr<Signal> &sig : sigs)
signal_map[sig->channel()] = sig;
// Populate channel groups