There is rewire for Reaper and when that was made I'm sure they were aware of other rewire features but I'd imagine one prob is that NINJAM timming is constant.
So grabbing a sync is probs the easy part but getting software to get on with that sync wouldn't be.
Possible probs and solutions could be as follows.
Problem:
Latency in starting aplication playing to actually playing, anyone who has tried to start Reason manually to sync in time will notice a delay between hitting start and it actually starting.
Solution:
Possible the same techniques as ninjams exact latency may fix this issue but then this might be a mean feat to archive along with there being an even longer delay before reason even started. And the whole process would probs be in beta for some time or never get out of a beta.
Another Solution/Problem:
One Solution that may work which would have to be in form of a plugin could be a bpm sync simular to whats found in some DJ Progs. I've seen a few progs about over time that read the beat from audio format as in reads the waveform.
Then they sync say the next track onto sync with the previous allowing for at the touch of a button syncing.
Problem:
This may have been already attempted as a plugin but maybe be also a tall order and then that would rule out Reason because it don't allow for plugins.
Solution:
If anyone knows of any software that uses rewire and that allows for a person to do tap tempo and that application will then follow speed of tap then this might help.
Then people could rewire there chosen application to the tap tempo rewire app. then sync this way.
When I sync it does not start instantly, there is some delay so I have to start half a beat before or more sometimes. So sometimes people will hear me start start start and so on to get in sync, I'm using numpad and will start stop start stop start stop to get on beat. Sometimes its easy sometimes its not, but I have my Cubase metronome going out on its own Asio Strip, so I can hear it but you guys can't. So I can get in sync before playing a note.
I have heard some people get spot on every time, maybe they have sussed it and might pass by here one time and shed some into on how they do it.
I personally don't like reason, i got it but didnt bother reinstalling it and it connects perfect with my cubase and has built in mastering suite and all sorts.
But its just a loops factory, mastered loops that uninspire and make all else sound bad.
No matter what people think about what I play as some might shout but ain't yours too? but no it snot, I play, and semi master stuff on the fly which Reaper and NINJAM allow you to do too.
I'm normally doing loads of stuff at once, typing, playing, recording at the same time so it maybe sometimes looks like I'm just turning stuff on and off but I'm not.
Its like Andre Louis when he plays drums on keys, you wouldn't believe it until u see it.
So I have setup a webcam with in another screen show what I'm doing in the pc aswell. I'm trying to get it as a stickam show. But when its on u can watch and join the cam chat room aswell as see others cams at
http://andycam.hopto.org
or
http://nincam.hopto.org
I recommend using first link if you have lower spec PC, I made the first page as minimal as possible for this reason.