The fundamental question that needs to be resolved before any progress can be made is whether the KaraFun Player accepts command-line inputs.

There's no user-doco that I can see in your package or on the KaraFun Player website that might shed light on that. Indeed, given the absence of any reference to command-line inputs, I'm guessing it doesn't. In that case, no amount of fiddling in Excel will get the KaraFun Player to play a sound track selected from a worksheet.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]