Thanks for your help!

 

I don't know where the number 7500 comes from but the calculation is right.

I do it this way:

60 sec = 60000 ms.

60000/125= 480

So each 480 ms there will be a beat or a kick or whatever is in time with the 125BPM music.

If the song is 4/4;

1 quarter note = 480 ms
1 8th note= 240 ms
1 16th note = 120 ms

So 60 ms is a 32nd note which is in time with the 125 BPM music, yes.

These times apply to everything you want in time, reverb and/or predelay.

But then again, does reverb have to be in time? Not always. Churches and big halls have beautiful natural reverbs but you can't change width and length of a church to the tempo of the music.

If you want to emulate such church reverb, you shouldn't calculate time but you should calculate how big the building is, to know when and how long reverb and predelay will occur. But for creative uses, you can of course use reverb in time.