(off-topic, after the GeoShred thread) iOS app "MIDI Guitar", iOS virtual MIDI apps

1) I happened to notice an iOS app named "MIDI Guitar":
MIDI Guitar by Jam Origin
https://appsto.re/nl/K7ClF.i

So the free app is for proofing that it works with your gear, then you can make two in-app purchases to unlock the full power.
(For those unfamiliar with the App Store: once an app has been purchased using a given Apple ID, you can download and use it on all devices associated with that ID at no cost. The same goes for in-app purchases.)

Note that this app lets you use a non-MIDI guitar to generate MIDI messages. There are more audio-to-MIDI apps. I haven't yet found the opportunity to evaluate them.
As I assume you to know, the problem of pitch to MIDI transcription is not so much in the determination of the pitch, but rather in the positioning of the Note On and Note Off messages in the MIDI file being generated. For mere playing (not MIDI recording), this may matter far less, hence the possibility of me driving my GR-30 at all.

2) An adjoining category of apps (for iOS, to a lesser degree also for Android) is that of emulators of microphones, amplifiers, effects and loudspeakers. Have a look at the apps and hardware by IK Multimedia and competitors, and patiently await their 50%-off app sales. ;-)
One in-app purchase for "MIDI Guitar" seems to unlock similar features.

3) I earlier mentioned virtual MIDI devices for iOS.
Looking at the apps on my iPad 4 that is dedicated music, I notice MidiBridge and Midiflow as examples of patchbays in software. There may well be more.

4) Rereading the above made me think of wireless MIDI. I seem to remember that I could install some driver (based on Apple's Bonjour service for wireless printing) for it on a Windows computer. So I was able to use some MIDI app on my iPad to record MIDI on my PC. I think that I reached the point of proof of concept. From iPad to Mac would be easier, but I haven't found the opportunity to check that.
(My recent contributions to this Yahoo group exceed my involvement in making music of the last five years.) :-(

--
Chris