Audio/mic issues. New ROM/radio. I'm probably an idiot.

I have a sprint galaxy s4. It has been rooted, the Sim was unlocked. I recently upgraded to CM12.1, and I has some issues, so I decided to try a different ROM.

This is probably where I went wrong. I figured, heck, let's update the radio/modem while we're at it. So I went through ODIN, tried to update, and it never took. The download always failed when flashing. Eventually it would only load into the download bootloader. It was late, so I just charged the phone and left it alone. The next morning, it loaded back into cm12.1. I decided to forget about the radio/modem, and installed the new optimized cm12.1 ROM.

Now, whenever I try to use anything with audio or the microphone, the audiofx force closes. Or on another ROM, DSP manager force closes. I cant hear or speak in phone calls, YouTube and music players say they can't play the audio/video.

I currently have baseband ending in mdc which is what I had to use to unlock the Sim. When i tried and failed to update the baseband i was trying mf9. I don't know why, really...
I have tried 3 different versions of a 5.1.1 ROM, all with the same result. No audio, phone calls are useless.

Please help! I'm not sure what to do from here.

Probably definitly bricked now.

Well, facing another problem.

I wanted to perform factory reset, so i reflashed stock recovery.
Flash was "probably" fine, no error in Windows.
I reboot device.

Then i power off to reboot to recovery with power & Vol up

And now, i'm stuck on a black screen, nothing appears, no recovery.
I try to switch off, long press power, working, but every time i try to power on now, black screen.

Help...