It seems that no one can explain what happens in Max 6.
With the same patch, the reverb effect in Max 5 becomes something like the ring modulator in Max 6.
I have contacted cycling74 support but also got no response.
It is very weird that cycling74 support told me the patch I attached just sound the same in Max 5 and Max 6.
Could someone help test the "revtest.maxpat" patch and let me know if it sounds the same in both Max 5 and Max 6 ?
I did notice that the vector size in Max 6 will automatically reset to 1024 for IO vector size, and 256 for signal vector size. When I set it to 128 for IO vector size, and 64 for signal vector size, then it sounds normal.
How do I know which will the best setting ? Or is it something that I need to try by error ?