It’s not that difficult in a nutshell. If there’s one system for each market type, it’s possible to mix them all together. Naturally the best expert advisors are able to mechanically note the market type and switch on the right system.

When you are trading by hand you always do it. You select a strategy for the correct market type, or wait for the proper market type to occur. Then perhaps it is definitely a good idea to employ a expert advisor only under certain market conditions if nothing else works.