Hi,   I'm not sure if anyone else has had this, but it seems that when playing customs for an extended period the song volume starts to decrease.  I have all bars up to 100% in mixer and have tried lowering all volumes as low as they go apart from the guitar 1 volume and then increasing my speaker volume, but this hasn't solved it.   Has anyone else experienced this and, if so, have a fix for it?   Foobs