with 4e186fa8 and using the bitstream in #829, the decode crash when switching from 24.4 kbps to 64 kbps. The crash happens at frame 60, in the function ivas_mdct_core_reconstruct_fx(). There at line 2298 you have : ``` e_tmp = add( e_nrgL, e_nrgR ); ```` where both e_nrgR and e_nrgL have undefined values. They are both derived from e_sig[0] which is derived from q_syn and q_syn is initialed with st->hTcxDec->q_old_synth at line 2049 which seems to be the source of the problem as it has an un-initialized value (-12851). My guess is that st->hTcxDec->q_old_synth should be set to a proper value during one of the switching function