@rtmusic that’s weird. I don’t remember having that issue. Perhaps the PiSound has physically changed since I got mine?
I ended up putting on a couple copper heat sinks that I had from another kit. Temps are ~68 C with Zynthian running and 4 instruments loaded - its working OK. I now have a kit of standoffs, bolts, and washers but I’m going to pause on trying the fan shim again until I need it.
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The Pisound form factor didn’t change, maybe the pimoroni fan changed instead? 
I’m pretty happy with my new RPi4 with Fan Shim installed. It was a little bit of a hassle getting everything into the Pisound case, but I managed to do so.
I needed to cut off some plastic from the jacks of the Pisound shield, find the right standoffs, and get the Fan Shim in the perfect position, so it actually gets power from the Pi. That was quite fiddly. Another problem I had was that the screen didn’t get recognised, when everything was assembled. The reason was that the micro HDMI cable didn’t get all the way in. So I cut off a chunk of the cable isolation, which solved that problem.
There is one problem left, though 
I can hear some vibration of the Pi from the fan. I already managed to get it as quite as possible, but there still is lil brrr in the air, if you know what I mean 
I use this in my studio right now, and it is quite annoying. Isn’t there any way to have a little control over the Fan and also use the Pisound shield? I have version 1.0
The Pimoroni Fan control uses some of the same GPIOs that are essential for Pisound to function.
The Raspberry Pi 5 fan avoids this issue altogether, as it hooks up to a dedicated connector on the Pi 5 itself, so it does not interfere with the GPIOs at all.
Thanks for the info. Well, I won’t buy another Pi 5 now, lol
maybe I can solder something together then
If I remember correctly there’s a bit of play on the spacing of the shim on the gpio vertically. You might try moving the shim up and down slightly to see if you can minimize the hum.