Make the Hydrogen Engine sound depend on load
I find it a bit odd that the hydrogen engine just keeps on going at the same RPM, regardless of whether it's powering a light bulb or a small factory. Sure, it's technically possible, but wouldn't it be much cooler if you could hear if the engine is idling or struggling? Even more so when talking rovers and other vehicles.
I have made a patch that does this. It is done similarly to other blocks that have similar features (MyMotorBase and MyMotorSuspension) and should be possible to integrate without much effort. The patch was made as an extension class and requires some minor adaptions to fit. I can do it upon request, but I will not be able to test it.