Hi @yyggithub , thanks for sharing your insight. I've also noted about it yet no room for fixing that. In my thought, that might be from VariationalGenerator where the Conv and ConvTrans pair applied as a frame-wise bottleneck so that the output could have such noise at the end. I surely believe that simple arithmetic can solve it, but I can't afford that for now. So it would be nice if you have time and can handle that by your side and then report them for the community. Thanks!