I'm confused? General Midi is more than just making Bank A acoustic guitar substitute for Bank GM acoustic guitar. The volume, pan, velocity, and all midi controllers are set the same for all GM banks....that is their purpose. It will sound the same on all synths that have GM. If you try to convert them to your A bank or B bank...the effects won't be the same, the volume won't, how hard you hit the note won't (velocity) etc. In otherwords, it will not sound like those great patches that you have in Bank A. Sure, some instruments might sound great but some will be 4 times louder or too expressive.