Hi,
"-can you select diferent instrument sounds (in octameds intsrument list) via the preset/midichannel on the controller keyboard?"
Yes should, you can set up each Octamed instrument, and set its midi channel. Then on the keyboard, switching instruments should play the corresponding Octamed sounds. But I normally work in the other direction from you: AMIGA -> MIDI KEYBOARD -> OTHER MIDI THING
"-if the setup is: "MIDI CONTROLLER -> AMIGA -> POLYPHONIC SYNTH" and on of the instruments in your instrument list midi is set to use a specific sound on the external synth, can you press more than one key on the controller?"
Umm yes?, look into 'chord' settings. With this, multiple keyboard notes get layed onto several Octamed tracks, last I tried.
-also will THIS be okay to use with an A1200?
Seems fine, does it have any internal sounds?
