On Launch GCP presents the file management screen where you can load the song song you want to work on. The help menu also links to some tutorial videos and the developers email/support address!
The Main GUI.
Strum and tap the strings below the chord name to play! Tapping the chord button triggers an automatic strum pattern. There are chord extensions on the left and a fretboard on the right provides chord inversions up the neck. This layout is also adjustable ( 4 choices ).
Click on the Cog Icon to reveal all the App's settings
Here we select what type of guitar sound is desired ... plus Reverb and Distortion for them all.
Choose a Root Note and a Scale Type to get started with some chords which sound good together.
There's only 3/4 and 4/4 ... maybe the Pro features add to this? I just don't know.
Choose a Tempo
This can adjusted at any time.
This is where each of the chords can be changed to meet your needs. There's a lot on offer... and a song can have two Banks of 6 chords.
If you want to get really clever a chord can be built from scratch making it possible to form inversion that can't actually be played on a real guitar ( by one person anyway! ).
Back in the main interface the Guitar Pick icon opens to reveal all available strumming patterns. There's a few built-in ones, but you can record a new one by tapping the 'Record Pick' and actually performing a strum action! Patterns can be assigned to particular chords if you like ... the little picks on the Chord Name indicate an assigned pattern.
If your strum recording didn't go quite as planned there's a very deep editor to adjust the position and loudness of each note in the chord as the pattern progresses.
Back in the Main window, tap the 'Sections' button to create a Section. Choose its length, hit the red Record button and play! The section then becomes available as a building block for your final song.
Alternate Playing Pads
If the guitar metaphor throws you a Pads only paying surface is also available...meh.
Sections all recorded? Tap the 'Four Square' button at the bottom right of the main GUI to open the Modes window. Probablt your next stop will be the Edit mode.
Each Section can be seen as a column of chords as you played them during record, running down the left. Simply select one, change it by tapping on chord names, fingering position, strumming pattern ... or use the up/down arrows to switch the order.
Once a you have a few Sections they can ordered, duplicated, selected or otherwise arranged to create a whole song.
Currently it seems like an Audio File of the Song or any section is the best way out of GCP. Audio Copy/Paste is also supported but the absence of AudioBus or IAA is glaring.