Re: Has anyone here tried the Boss SY-300
I bought one last year, but owing to a slightly chaotic living situation I haven't had much chance to fiddle with it yet.
When I can say is that it works flawlessly, in that there is no delay. I ran into some problems with polyphonic passages, but I think it worked well with three or fewer notes. I think it started "swallowing" notes if I tried more, but others might have better luck.
This should be familiar to most people interested by now, but in case not, I should add that this comes with a trade-off: the unit can't fire samples, be connected to other synths etc., because it never changes your signal into midi. What comes out is rather a manipulation of your guitar signal. In other words, you can forget about trying to get a realistic piano tone out of it, unless you are way better at programming synths than I am! For more, well, abstract sounds, it sounds quite good.
I rather like the sounds it can make, though, and look forward to trying to integrate it into my playing.