Hi Christophe;
You cannot have an audio file play along with a KBS session, unless you "mix" the two files. To mix the files, you would have your Kasina set to play the KBS session, and you would feed the audio from your track into the Kasina via the AUX audio connection, or from your computer to the Kasina via USB audio. If your Kasina firmware is up to date (latest is 2.06) you can adjust the volume level of the KBS sounds and external audio within the Kasina. Press the volume up (+) and down (-) buttons simultaneously to bring up the audio mixer on the Kasina.
You cannot play the audio file and KBS session just on the Kasina.
If you want a session to be completely self-contained, you should use the SpectraStrobe format. There are free plugins
here for your favourite DAW, and it should work with Garageband.
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