The latest PSP MixPack version supports static delay compensation for the best compatibility with various audio applications. If your audio application doesn't support compensation please use values listed below for correct timing:

PSP MixBass 1023 samples*
PSP MixPressor 1023 samples*
PSP MixSaturator 0 samples
PSP MixTreble 1023 samples*

* the value for all sample rates from 44.1 to 192kHz
Mateusz Wozniak