The Guitar can provide sound input, but I'm pretty sure it can't provide midi input (not without some major hacking). The midi interface on the amp is in/thru only. I expect the midi capabilities will be limited to controlling the amp (gain, eq,
).
Thank you for the correction. I didn't pay close enough attention
to the pic of the midi box. Now to answer the original question
of what you can achieve with it using an Amiga, that mainly depends
on the features and capabitilies of the amp it is made for. Sequencers
like Bars&Pipes can still be used for this application, the difference
being its outputing specific control data vs "music" data to manipulate
the amp.
C Snyder