Swiss MP3 Player - bouncing trigger switch contacts and further improvements

[BorgNumberOne]

Describe the bug

With the great help of Swiss and with the help of a GameCube BBA device and a SMB1 server we are using our gamecube as mp3 player frequently.
(breakfast, lunch, dinner, in between during the day).

But there is a small bug:
Bouncing L/R Trigger buttons while selecting next/previous song.

I tried different GameCube controllers and everytime it is difficult to switch to just to the next/previous one song.
In many cases the Swiss MP3 player switches to the second/third/fourth/... next/previous song instead.

Steps to reproduce

Steps described above/before.

Expected behavior

It would be great if the L/R trigger buttons could be debounced in swiss' MP3 player.
The same with volume control.

In the same context it would be great, if (playing a MP3 file and) holding a trigger button (next / previous song) for 1...2 seconds then in these 1...2 seconds nothing should happen.
After further holding the trigger button then the
next...next...next/prev... prev... prev... song should be selected in a slow speed.
After releasing the trigger button then the selected song should be played.

If a trigger button is holding longer than 2 seconds the seeking next/prev MP3 title feature should be faster. After holding longer than 4 Seconds, the seeking next/prev MP3 title should be even faster.

It should be figured out if the suggested values (1/2/4 seconds) are OK or if there are better values in practise.

Relevant log output

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