Mystified about your comments that the LAPC-I is 'write only'.
Sorry I wasn't clear. You can read data from external devices connected to the LAPC-I,...
I'm not familiar with VSTHost, so I cannot help you. That's why it is a good idea to post in a forum that is dedicated to the product you are using.
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Since your question appears to be about Logic Pro, I think you will get more responses to your questions if you post in a forum where there are a lot ...
Here is a reasonable article on desktop music production: How to Set Up the Ultimate Desktop Recording Studio
It will give you and idea of what is in...