I used a WX11 for a long while.
Now, as far as inputting music, I had fairly old (now) versions of Finale and Mark of the Unicorn's Performer. The WX11 was MIDI-aware and I just had to hook up the old MIDI interface and connect the standard in/out cables and viola.
I really do mean "viola". I heard strings.
Anyhow, Finale and Performer allowed several different ways of entering music. One of the more simple ways was to set up a "beat" track (I had the beat pulsing through my Yamaha FB01, Roland D5, Roland U110 or Roland D50 -- old skool rocks!) and then play to that. I kept it very slow, as I found the WX11 to be very touchy on getting the notes right (both duration and pitch) -- at least for Finale/Performer to be happy.
As an alternate way of entry, I could get the D50 hooked up with a "sustain" pedal and tap the beat with my foot on the pedal. I wasn't consistent enough to do this, but the gentleman I worked for could do this, without issue -- however, he never used the WX11, he only used his D50. Yes, he was also a sax guy, like me.
While the WX11 is more old skool than the WX5, they both use MIDI and if you have a MIDI interface, I'm relatively sure you can play into just about any newish music app. Hey, I stopped my life in electronic music in the mid 1990's.