This morning another Logos forum member seemed driven to give up his iPad in favor of a L5-running tablet-ish. Don't dump the iPad just yet!
Given Logos also supports hymns (along with MIDI) and litergical text, maybe some forum members play traditional organ (stops, etc).
If so, check out Markus Sigg's work on iTune apps. Absolutely gorgeous playable organs from Sweden. There's two free examples, and three paid ones. Plus a utility for re-creating room reverbs.
My absolute favorite is the Menzel for the funeral chapel in Burea Sweden. Who'd of thought, out in the middle of nowhere. We layer it over top two Yamaha keyboards.
But back to Logos-y world, you can put together a great traditional organ music setup with iPod (me) or iPad, MIDI/Core interface, speakers, and small keyboard. PCs struggle; Macs cost. I'm talking about smaller churches out in the middle of nowhere; we go camping and on Sundays, run into a bunch of them, also on the reservations.
And if indeed you pursue this, Sigg apps all conform to Core MIDI as well as slot into Audiobus (input and effects). On my iPod I've yet to overwhelm the CPU.
I don't know Markus; just enjoy Logos hymns/liturgies and traditions.
And if you like traditional gospel music and quality organ accompanyment: 'Hymnal' app. Sweet memories.