Every time I request the number of tracks on the SD card, it returns 0.

[JGomezC145]

I request the number of tracks using .getNumTracks(), but it always returns 0. However, if I activate a trigger on the board, the sound of that trigger plays, and if I play a specific track from Arduino, it works. But I never get the correct number of tracks, and .getVersion(gWTrigVersion, VERSION_STRING_LEN) doesn't return anything either; it's always null.

[nomakewan]

Both getVersion() and getNumTracks() use update() internally to receive data from the WAV Trigger. They are in fact two of the only three functions which do this (the last being isTrackPlaying()), so we have a common thread to work from.

If numTracks is always 0 and gWTrigVersion is always null, that means those variables are never reached by update(). For sanity checking, you could also check the values of versionRcvd and sysinfoRcvd after running getNumTracks(), but my bet is they will both be false. My assumption here is that the Arduino is not actually receiving data from the WAV Trigger at all in your case, and so these switch cases in update() are never being run.

[nomakewan]

As was pointed out in another repo, make sure you have setReporting(true) in your code to enable RX feedback from the WAV Trigger. All the functions that rely on update() will not work if reporting is disabled.

EDIT: So now that I have a better understanding of how this all works, setReporting(true) is just for knowing whether a specific track is in fact playing or not at the moment you ask. It is not necessary to enable it just to get the number of tracks on the card.

If you are getting 0 tracks and a null return for getVersion() I'd wonder if there is a wiring issue on the WAV Trigger's TX line. It doesn't need TX to operate via serial, but it does need it to talk back.