Hi there, got problems???
Answer 1:
This is solved by telling the synth that it will receive Program Change from external channel. Probably you will set this for the all channels at once, but sometimes you may set it for each channel. So look for Program Change in your manual and in the Combisound menus.
Answer 2,3:
There are not many synthesizers on the market that can assign different effects on different channels. This is not possible because you will need a complete FX-unit for each individual channel and that would be to expensive. Therefore you are restricted to use one global effect in a combi and I agree that it is boring, I have the same problem with my Korg Wavestation.
An advice would be to get a cheap FX-unit like the Alesis Nanoverb to have some choice, but this will of course cost money.
Good luck to you and send me a mail if you have problems, says:
PEO!