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The firmware supports about 83 IR protocols, but even with that, it's not mandatory that it works with all existing devices.

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If it can run at the right speed or frequency or whatever, I'm perfectly happy for it to work purely by recording and replaying signals that I give it with my remote.

https://github.com/probonopd/irdb

See here for a very large database of IR signals that works with the firmware.

Have you looked into "USB IR Toy" (both versions) ? - http://dangerousprototypes.com/docs/USB_Infrared_Toy and http://dangerousprototypes.com/docs/USB_IR_Toy_v2

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