I installed pinsound+ in a friends Lotr with the same usb stick as pinsound themselves sell.
I noticed to that when the ball is in the shooter lane their is no music till you shoot the ball and it hits the first switch. For the rest it appears to be OK but if a sound is not played I would not notice it anyway I guess.
Sometimes the sound is a little choppy but my guess this is because of a lack of enough power. I recognized the same issue when installing a pinsound in a friends Elvis. Gonna install an external power supply to overcome this.
The sound mix i used is V1 downloaded from the Pinsound community like 2-3 weeks ago.