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Ok, I've now found a term I hate more than "Soundboard". If you're referring to MP3 or WAV files as "Soundfonts", please just... stop. Stop. Now if you wanna talk about the majestic glory of MIDI files and how  we should convert all audio media into their synth-y goodness, ok. I'm listening.
And no, you can't just upload/copy/drag n' drop etc new audio files onto the saber.