Radio Shark no audio with El Cap - fixed!
JUst thought I'd post a fix if anyone out there still has a Radio Shark (by Griffin) and has lost audio when upgrading to El Cap.
SOme background. After upgrading to El Cap, I found my Radio Shark audio was gone. The Radio Shark input was still visible in the sound system prefs, and in fact the audio made the LED-style sound level meter in the input prefs window move, but you just couldn't hear the sound. Even weirder, when Skyping, the person I was Skyping with could hea the audio from the Radio Shark if the application was open, but I couldn't.
I went to the Griffin support pages, and they basically said, hey, it's had a good long run, but we're not supporting this anymore. I played with MIDI settings using the MIDI utility, but no luck. Last night, in an idle moment, I did another search, and found a mention of a solution on like, page 7 of 15 in a long thread somewhere (not here), and much to my delight, it worked for me!
THe fix involved opening Final Vinyl, and setting the input (in the preferences for that program) to the Radio Shark. I quit Final Vinyl, and restarted the Radio Shark app, and I had audio!
I just happened to have a copy of Final Vinyl, but as I understand it, it's now free. I would check the Mac app store first, but it's also available on Softonic and Macupdate. I have not used either of those lately, but it seems like these days such downloads may also get you Mackeeper and the like, so be careful.