hmm…
well I cannot compare, as not seen the Elyra in person, nor played it.
but in terms of synth/guitar crossover, here’s what I can say about the Eigenharp.
(I’ll talk about the Alpha, but most applies to the Tau, less so the Pico)
it supports a strum mode (implement by Geert, long before he did it on linnstrument ;))
this actually works really well, as it uses the lower percussion keys as the strum ‘keys’.
(remember these also have full expression, and are extremely light touch, as is the whole eigenharp)
as for aesthetics… this one (imho) the eigenharp is hard to beat for ‘performance’
its one of the few, expressive controllers that is designed to be worn, and performance was a critical goal.
the designer said, they wanted to bring the keyboardist out front, centre stage … rather than being stuck behind the keys at the back
so, the eigenharp is designed to be played on stage,
you can have a 30m cable, so that the computer can be off-stage.
the strap is designed with a single connection point, so you can ‘perform’ (swing it around like a rock star ) , but due to CoG is perfectly balanced.
it has mic (on breath pipe) /headphone (for in ear monitors) inputs
yeah, its ergonomics are designed around holding it similar to a guitar, it feels natural - playing from both sides is never a stretch.
of course, it cannot really be played ‘on a desk’, the alternative is to play like a ‘cello’ with a spike seated, which also works really well.
I guess my point here is… these were obvious design goals from day 1, rather than trying to adapt a ‘desktop instrument’
as for controller vs synth, I think thats kind of a moot point these days.
these days, even an SoC like a rPI is powerful enough to ‘drive’ these things,
or as then Eigenharp was designed its fine if you have a stage box as long as the cable is long enough…
lets face it an electric guitar is ‘connected’ to the stage via audio cables… and its done ok
overall, yeah the strumming method is fun for certain types of sounds.
but I think like any instruments it benefits a lot if there is tactile feedback
(which is hard to tell on videos Ive seen of this)
aesthetics, partly its personal taste…
(of course, in performance, you might also care about what the audiences sees, as it could be considered ‘part of the show’)