Yes, origanal was well compressed (472 Kb/s)So, is this like general case for lossyFLAC (lossyWAV) to behave like this if FLAC compressed the material at < 500 Kb/s (for -q5), or this are some exceptions caused by known content of source material?
But the better FLAC compression is on its own, the higher the chance that lossyFLAC makes it worse. With relative quiet music originating from one or few instruments lossyWAV is more of a disadvantage than an advantage.
I wonder if it would be possible to implement a special LossyWAV switch for FLAC? It would tell FLAC to encode each 4048 samples once as a whole block and once divided into 4 blocks of 512 samples and choose whatever compresses better. Do the FLAC specifications allow for such a variable block size?