I think much of the scanning crowd has either 1) abandoned interest in digital trunking systems or 2) switched to SDRs, which is an unfortunate state of affairs as the state-of-the-art in SDR trunking decoders is actually pretty bad.
If I recall correctly some of it is licensed and/or patented and people are just having to reverse engineer the protocols. I’d pay for a commercial demodulator to snap in.
I used it for decoding the AMBE+2 stuff on newer P25 systems. It wasn't great but it did mean I didn't run afoul of any patent issues if I wanted to sell the system to someone else. OP25 is great but I didn't want to take the risk.
Whatever I was watching recently still had that slurring effect in all of the speech that I recall from back in the day, but I just checked out some recent recordings from OP25 and that is actually quite a bit improved. May just try that out first and see where it goes. Thanks!