Not only digital, but based on the chart none of the instruments listed produce sound in the range above 20khz either which is one of the reasons why redbook CD was designed the way it was and most systems only shoot for out to 20khz.
https://i.pinimg.com/originals/8b/4a/6f/8b4a6fd7b8d65711eed41850a194284e.jpg
So there is not even any music there above 20khz for the transducer to reproduce regardless of format. Just noise. Maybe with a synthesizer or a dog whistle.
Looks like the fishing hole is empty over 20khz so if you catch something up there it isn’t a fish.
https://i.pinimg.com/originals/8b/4a/6f/8b4a6fd7b8d65711eed41850a194284e.jpg
So there is not even any music there above 20khz for the transducer to reproduce regardless of format. Just noise. Maybe with a synthesizer or a dog whistle.
Looks like the fishing hole is empty over 20khz so if you catch something up there it isn’t a fish.