Reading Ond's excellent
The Web vpin thread has put me in mind of some of the updates I'd made to this machine over the past year.
The first was the addition of a sound-activated 5V LED light bar which fits under the glass at the top of the playfield monitor. It animates like a VU meter and color cycles in time with whatever sounds are being output from the machine. It's basically just a bit of bling, but I find that it does enhance gameplay in that the flashing lights actually tend to force me increase concentration on the playfield itself, which is kinda neat. Video file was too large to upload, but here's a screencap of what it looks like:

I also switched out the original audio amplifier pcb (a TDA2822 unit at 5V, robbed from a soundbar) to a TPA3110 unit at 12V, and added a pair of 30mm exciter speakers adjacent to the flipper buttons for some haptic feedback:

The changes to the components above led me to add another buck converter to the machine, as the previous amplifier had been USB powered and with the addition of the LED bar and amplifier the machine now had a need for adjustable outputs for both 5V and 12V. I decided to consolidate the buck converters and relay into a single module to clean up the installation and to move the adjustment trim pots to a more accessible location:

Voltage readouts were added to the new switching unit to simplify diagnostics and adjustment during installation:
Most recently these Rollie Leaf Switches were produced and made available again, so I jumped on an order and switched out the original micros. They've made a definite improvement in playability:


I still haven't made the move to adding analog nudge, but part of the reason for that has been waiting a bit on software maturity in the Standalone/Batocera ecosystem.
VPX Standalone itself has made enormous strides over the past year, but the latest improvements haven't yet been ported into Batocera and I'm unwilling to upset what is otherwise a completely functional system to chase (fairly convoluted in Batocera) manual point updates. Instead, I'll wait to update until 10.8.1 hits official release, rumored for Batocera V44.