strangeness while using [record~] with predefined input volume

prko's icon

Dear advanced users,

can anyone explain why the fade in and fade out in 1000 ms in the following patch do not work?
I think it is all correct.
I also see the graphic value of output signal.
But in the buffer, the fade-in and fade-out are not recorded.

best,
prko

Max Patch
Copy patch and select New From Clipboard in Max.

prko's icon

However, the fade works well with [line~]!