playing a file on file player, sending midi program changes = glitches

Hello,

I am having the issue described in the header and I'd like to check if it is a problem in my setup or anything, here are more details:

I play a file through a fileplayer. Checked with different files: shorter or longer the are playing fine. Its output goes straight to main output.

I am controlling some contraptions and vsts presets via midi program changes. Note the audio of the file player isn't processed by these contraptions.

When I start to send program changes I got glitches in the audio file being played.

This is quite annoying when doing quiet situations.

Can anyone reproduce this ?

thanks,

Luca