I use Firefly on a LS Pro, using stock firmware not the jtymod version. I have one problem with it - I have to keep Bonjour running on a PC in order for the FF library to be seen by Soundbridge. When I asked about this, the FF forum response was it must be the router. I seriously doubt this otherwise the DAAP packets would not be getting through to the PC.
What I suspect is the problem is that the RCP packets are not getting out of the LS despite the log file saying they are being sent. If you have a Roku branded Soundbridge then perhaps this will pick up the DAAP packets directly. The Pinnacle branded versions are not DAAP enabled.
Now comes the difficult part - the FF web site is unavailable again. I have an offline version of the LS Pro install instructions and you also need the install packages. I suggest you send me a PM and we can work out a way of you getting this.
R1000, M400, M1001