You can use a bus pirate as a LA instead of Audacity for these signals since they're so low-tech: http://tinkerman.cat/decoding-433mhz-rf-data-from-wireless-s...

Related, for OOK: https://www.embeddedrelated.com/showarticle/626.php

http://rayshobby.net/rftoy/ is also fun if you want a more "let me play with something that already works" type gadget.

Audacity does work well enough for IR though, and these are the best transceivers I know of: http://www.iguanaworks.net/products/usb-ir-transceiver/