Hi,
My assumption is they’re fundamentally just presets… Probably the most common parameters are set and then all the other ones are provided if you wish to tweak the presets to make slightly different effects. ?Also since sysex changes can be recorded and played back so I imagine Yamaha added them with the idea that people might do different types of automated/recorded sweeps of various parameters. ? Of course I don’t know what Yamaha engineers were thinking or if this was just more or less marketing to be able to specify a certain number of presets for chorus, ?reverb, and effects but often times even completely different instruments are just small changes to other instruments in terms of XG params (or General Midi for that matter)
Of course, Even small changes in a parameter can make a pretty profound effect on the output sound (provided the Audio stream and monitors are really high quality). However, I certainly am no audiophile so I probably could not discern a lot of the subtle differences… Not saying this is the actual reason in your case, just putting it out there as one possibility.
I hope that makes sense. ?
Of course, it’s all just my humble opinion.
Cheers,
Eric
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“The longest journey starts with the first step." ?- Lao Tzu
Eric