@Roberto_Grieco I replaced my Raspberry Pi 4 for a Pi5 and now everything works fine.
I haven’t changed anything else in the setup other than the raspberry.
how is this possible.
In this setup I no longer have to upsample via FusionDSP 
Spotify also works well with the old 4.0.5 Spotify version and the new 4.1.0. nice work 
what still needs to be done is "dtoverlay=hifiberry-dacplus
" in the boot/userconfig.txt Because of this.
so with a raspberry pi3 and 4 it doesn’t work with peppy meter in my setup.
setup
ian canada isolator II
ian FifoPi Ma 1.5.
ian ess saber mkII
ian IV output transformers.