That is really cool app, reminds me of small MIDI devices made by "MIDI solutions". One box does about the same as 10 lines in streambyter rules and is about 150 dollars.
I noticed it is hard to edit presets ( filters, mappers, streambyter rules and others ) for MIDI ins / outs . They are not displayed when the MIDI device is not plugged or an IOS app is not running. Also I have few MIDI hardware interfaces that have different names in IOS and I need to repeat all my settings for them all. Typing and typing streambyter rules all over again. Then I do the same for IPAD.
I think it would be nice to have presets independent of sources and destinations and kept separately in text files. So that I could edit them without any devices plugged and apps started, and those may be shared on the web for upload / download or sending by email. Would be nice if they can check if apps used in them are started and hardware is plugged. If not would be nice to get warning messages.
Then I think that for easy way to configure there should be GUI settings and streambyter looks an alien here.
The full management may be done only via text file and there will be no any GUI there. Thus if we need to connect Yamaha MIDI interface to Thumbjam and Thumbjam to Magellan we may have something like this
My preset #5 for Yamaha
MidiBridge = 0
'Yamaha MIDI' = 1
Thumbjam = 2
Magellan = 3
1 = 2 2 = 3
!#stream 1 out
X0 = X1 # stream byter rules not accessible via GUI